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Best Hole Enlarging Drill Bits – Top 10 Rated & Reviews

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Bestseller No. 1
CO-Z 5pcs Hss Cobalt Multiple Hole 50 Sizes Step Drill Bit Set with Aluminum Case
  • Cobalt high speed steel along with the titanium coating ensures extreme durability, will stay new and shiny for years to come.
  • Different sized shanks ensure compatibility with 1/4, 3/8 and 1/2 in. chuck sizes.
  • Non-walking drill tip provides fast and smooth drills on steel sheets, aluminum sheets, wood board, plastic board etc. (the board must be smaller in thickness than the height of step drill bits).
  • Please mark the spot that you are to drill for easier drilling and improved drill bits life.
  • All the bits come in a well-organized case for easy transport and storage.
Bestseller No. 2
Irwin 11581 Unibit21M 20-Millimeter to 34-Millimeter by 1/2-Inch Shank Hole Enlarging Step Drill Bit
  • These IRWIN Unibit step drill bits have a hex shank to help prevent slipping in the drill chuck
  • This Unibit step drill bit uses a single-flute cutting edge for greater control and true, round holes
  • IRWIN Unibit #21M step drill bit creates holes from 20mm to 34mm with 8 steps
  • Ideal for drilling holes into thin materials, such as stainless-steel, copper, brass, aluminum, plastic and laminates
  • Maximum material thickness of 5mm
  • These IRWIN Unibit step drill bits have a hex shank to help prevent slipping in the drill chuck
  • This Unibit step drill bit uses a single-flute cutting edge for greater control and true, round holes
  • IRWIN Unibit #21M step drill bit creates holes from 20mm to 34mm with 8 steps
  • Ideal for drilling holes into thin materials, such as stainless-steel, copper, brass, aluminum, plastic and laminates
  • Maximum material thickness of 5mm
Bestseller No. 3
IRWIN 10220CB Unibit 1/16-Inch Hole Enlarging 8-Steps Cobalt Step Drill Bit
  • Made in: United States
  • Power Cutting & Sawing
  • Package Dimensions: 1.016 H x 15.24 L x 6.858 W (centimeters)
  • Country of manufacture: United States
Bestseller No. 4
CO-Z Large HSS Spiral Groove Step Drill Bit, 12 Sizes Titanium High Speed Steel 1/4" to 2-3/8" Drill...
  • The step drill bit is made from upgraded high speed steel characterized by well-balanced toughness, wear resistance and red hardness properties for better and faster hole -drilling performance. The titanium coating makes the drill bit more durable so that it can last for years with uncompromised quality.
  • The dual-flute design prevents metal fillings from flying around and clears chips faster thus it can drill more smoothly without heating up.
  • The rapid strike tip drills twice as fast as the average step drills and can drill acrylic, PVC, wood, aluminum and iron sheets up to 0.2’’ in thickness.
  • Our drill bit is bigger in size so it can drill holes with larger dimensions.
  • 12 hole sizes: 1/4; 3/8; 19/32; 3/4; 1'; 1'3/16; 1'3/8; 1'5/8; 1'3/4; 2'; 2'3/16; 2'3/8.
Bestseller No. 5
CO-Z 10 Sizes Titanium Step Drill Bit, 1/4 to 1-3/8 Inches High Speed Steel Drill Cone Bits for...
  • Hss & Titanium Coating ----- High-speed steel makes it last longer than others, titanium coating ensure easily cut through iron sheets, aluminum sheets, copper & plastic & wood board and many other types of sheet metal with ease, and it can automatically deburr holes while drilling to keep the drill bit clean.
  • Titanium Coating ----- Coated with titanium, this step drill set performs well in heat, corrosion and rust resistance.
  • Revolutionary Design ----- Tri-flatted shank fits into power tools chuck securely and eliminates slip; two-flute design clears chips faster and allows particles to escape easily.
  • Includes 10 STEP SIZES ----- 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8".
  • A Must-Have for Handyman or Professionals ----- Perfect for home repairs and light jobs such as drilling holes in plastic, aluminum, copper, iron and many other types of sheet metal (excluding steel or any other harder metal).
Bestseller No. 6
FACHLICH 20mm Diamond Milling Bits for Porcelain Ceramic Marble Granite Existing Holes Enlarging...
  • 20mm vacuum brazed Milling Bits for porcelian tile granite and all similar material
  • Diameter: 20mm, Workable length: 50mm, Grit: #50/60, Total length: 65mm
  • Produced in vacuum brazed technology which could provide high efficient working performance
  • Enlarge, shape and/or round bevel existing holes in Porcelain, Hard Ceramic, marble and granite
  • Grit #50/60 provide you great finishing; With 5/8"-11 thread, used on angle grinder, very easy to operate
Bestseller No. 7
Yangoutool 5PCS Titanium Step Drill Bit Set with Automatic Center Punch,Multiple Hole 50 Sizes...
  • 【HSS Titanium Coating】High speed steel along with titanium coating ensures outstanding durability and sharpness, can reduces the friction, runs cooler.
  • 【50 Size in 5 Bits】 The bits set includes five standard step drill bits that can replace 50 individual drill bits, you can process 50 different kinds of diameter holes with the five pieces.
  • 【Easy Drilling】Double cutting blades and X-type openings design ensure a faster, stable and smoother cutting; 3-sided shank design prevents slip in drill chuck providing with small pressure.
  • 【Automatic Center Punch& Protective Aluminum Case】 The center punch help you mark the center point that you want to drill, with exquisite aluminum case protects the drill bits not easy to dull and prolongs the drills lifespan.
  • 【Widely application】 The step drill bits can be used to chamfer, bur, and drill or enlarge holes. The step drill bits can work with stainless steel sheet, aluminum alloy, plastic material and wood.
Bestseller No. 8
COMOWARE Step Drill Bit - Titanium Coated, Double Cutting Blades, High Speed Steel, Short Length...
  • HSS Titanium Coating - High speed steel along with titanium coating ensures outstanding durability and sharpness, can reduces the friction, runs cooler.
  • Meet Your Demands - With the step drill bits we offered, you can process different kinds of diameter holes, which greatly saves you a lot of trouble.Great for steel sheets/ aluminum sheets/ copper/ plastic/ wood board and many other types of sheet metal with ease countersunk. Suitable for Home DIY, and General Building/ Engineering Use.
  • Design - The split point tip is at 118 degrees to increase the wear resistance. The two flute design provides a smoother cutting, allows the material particles escape easily for a much more clean drilling operation.
  • Safety and Stability- The 3 flat shank is better clamped on the pistol drill to prevent slippage and shedding during the rotation.
  • Size Includes - One drill with 10 steps: 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8" can fit the majority of brands currently on the market.
SaleBestseller No. 9
DEWALT Titanium Drill Bit Set, Pilot Point, 21-Piece (DW1361)
  • DEWALT drill bit set has connectable accessory storage system to optimize storage space
  • Patented bit-bar design of the drill bits set allows easy removal of bits and customizable placement
  • Clear lid of the titanium drill bit set allows you to easily see contents at glance
  • Clip latch for secure closing
  • Small Bulk Storage size fits inside the Small and Medium ToughCase plus (sold separately) - Ideal for organizing loose bits
  • Patented web taper increases the rigidity of the bit to decrease potential for bit breakage
  • Proprietary Pilot point tip delivers speed and clear, burr-free holes which help reduce bit walking
  • Ideal for metal, wood, and plastic
Bestseller No. 10
CO-Z HSS 5PCS Titanium Step Drill Bit Set with Automatic Center Punch, 50 Sizes in 5 High Speed...
  • HSS Steel Construction ----- High-speed steel construction for longer cutting edge life even at extreme temperatures.
  • Titanium Coating ----- Coated by titanium, this step drill set performs well in heat, corrosion and rust resistance.
  • Automatic Center Punch ----- Delivers an automatic, high-impact, spring-loaded strike when pressed against surface, adjustable cap regulates striking force.
  • 50 Size In 5 ----- The bits set includes five standard step drill bits that can replace 50 individual drill bits.
  • A Must-have for Handyman or Professionals ----- Perfect for home repairs and light jobs such as drilling holes in plastic, aluminum, copper and many other types of sheet metal.

Trending Hole Enlarging Drill Bits to Buy

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