10 bestStep Drill Bitsof July 2025
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1
DEWALT DWA1789IR 7/8-Inch-1-1/8-Inch Impact Ready Step Drill Bit
DEWALT
10.0
40% off
2
ZELCAN Step Drill Bits, HSS 5PCS Titanium Step Drill Bit Set, 50 Sizes in 5 High Speed Steel Unibit Drill Bits Set for Sheet Metal with Aluminum Case, Multiple Hole Stepped Up Bits for DIY Lovers
ZELCAN
10.0
9% off
3
Milwaukee #4 Step Bit 3/16 - 7/8
Milwaukee
9.8
4
IRWIN Step Drill Bit Set, General Purpose, 4-Piece (10225)
Irwin
9.6
5
Klein Tools KTSB15 Step Drill Bit No15, Double Fluted, 3-Hole Sizes
KLEIN TOOLS
9.4
OtherUp to 7% off
IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231)
THINKWORK Four Spiral Flute Step Drill Bit Set, 5 Pcs HSS Step Drill Bits (1/8"-1-3/8") Unibit Step Drill Bit, 1/4" and 3/8" Shank Step Bits for Aluminum, Wood, Plastic, Metal
Step Drill Bit Set, Hss, 1/8-1-3/8 in, 4 Pc
Bestgle 3 Pcs Step Drill Bits 1/4" Hex Shank SAE Quick Change HSS Titanium Coated Imperial Spiral Grooved Step Drill Bit Set DIY Metalworking Woodworking Tool for Wood, Plastic, Steel, Aluminum, PV
6
New Milwaukee 48-89-9221 3 Piece Step Bit Set Black Oxide Step Drill Bit
Milwaukee
9.2
7
NEIKO 10181A Step Drill Bit Set, 3 Piece, Spiral Grooved for Faster Drilling, Step Bits for Stainless Steel, Metal, Wood, Plastic, Unibit Cone Drill Bits with 31 Step Sizes Total
NEIKO
8.9
8
Milwaukee #5 Step Black Oxide Drill Bit 1/4-inch - 1-3/8-inch (48-89-9205)
Milwaukee
8.7
9
DEWALT DWA1790IR 3-Piece Impact Ready Step Drill Bit Set
DEWALT
8.4
10
Milwaukee 48-89-9224 Step Bit 6-Piece Set (#1, 4, 6, 7, 8, 9)
Milwaukee
8.2
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A Guide to Selecting the Best Step Drill Bits
Choosing the right step drill bit can make your drilling tasks much easier and more precise, especially when working with sheet metal, plastics, or thin materials. Step drill bits are designed to drill holes of various diameters with a single bit, thanks to their stepped design. To find the best fit for your needs, it's important to understand the key specifications and how they relate to the type of work you plan to do.
Material
The material of a step drill bit determines its durability and suitability for different tasks. Common materials include high-speed steel (HSS), cobalt, and titanium-coated bits. HSS is good for general use on softer materials like plastic and thin metal. Cobalt bits are tougher and handle harder metals, while titanium coatings add extra wear resistance. If you mostly work with softer materials, HSS is usually enough. For frequent or heavy-duty use, especially on tougher metals, consider cobalt or titanium-coated bits.
Step Sizes and Range
Step sizes refer to the range of hole diameters the bit can create, and how many different sizes are available on a single bit. Some bits have small increments between steps, while others have larger jumps. If you need precise control over hole size, look for bits with smaller step increments. If you only need a few common sizes, a bit with larger steps may be sufficient. Think about the typical hole sizes you need for your projects and choose a bit that covers those sizes.
Shank Type and Size
The shank is the part of the bit that fits into your drill. Common shank types include round, hex, and tri-flat. Hex and tri-flat shanks provide better grip and reduce slipping in the drill chuck, which is helpful for more powerful drills or tougher materials. Make sure the shank size matches your drill's chuck size—most household drills accept 1/4-inch or 3/8-inch shanks. Check your drill before buying to ensure compatibility.
Coating
Coatings like titanium nitride or black oxide can improve a bit's performance by reducing friction and increasing resistance to heat and wear. This means the bit will last longer and cut more smoothly. If you plan to use the bit frequently or on tougher materials, a coated bit is a good investment. For occasional or light use, an uncoated bit may be sufficient.
Number of Steps
The number of steps on a bit determines how many different hole sizes you can make with it. More steps mean more size options, but the bit may be longer and harder to control in tight spaces. If you need versatility and work with a variety of hole sizes, choose a bit with more steps. If you only need a few sizes, a bit with fewer steps may be easier to handle.
Point Angle
The point angle is the angle at the tip of the bit, which affects how easily it starts drilling and how cleanly it cuts. Common angles are 118° and 135°. A sharper angle (like 118°) is good for softer materials, while a flatter angle (like 135°) is better for harder materials and reduces walking (slipping) at the start. Consider the materials you’ll be drilling most often when choosing the point angle.
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