Step Drill Bit Set with Countersink: What You Get
By Drill Hog® | Published: 2026-10-27
Category: Buying Guides
Learn what's included in a step drill bit set with countersink, including sizes, coatings, and practical benefits for metalworking.
Quick answer
A step drill bit set with countersink typically includes multiple spiral flute step bits covering a range of hole sizes plus a separate countersink tool for chamfering holes. The Drill Hog® ALTIN Cobalt M42 Quad Flute Step Drill Bit Set, for example, comes with three step bits and a free countersink set.
What sizes do you get?
Step drill sets vary in the number of bits and steps per bit. A common configuration includes a small bit (e.g., 3/16" to 1/2" with 6 steps), a mid-range bit (1/8" to 1/2" with 13 steps), and a larger bit (1/4" to 3/4" with 9 steps). This range covers most sheet metal, electrical panel, and automotive tasks without needing separate twist drills.
Why ALTIN cobalt M42 matters
ALTIN (aluminum titanium nitride) coating reduces friction and heat, while M42 cobalt steel retains hardness at high temperatures. Together they extend bit life in stainless steel, hardened steel, and other tough materials. Uncoated HSS step bits dull faster and are better suited for softer metals or occasional use.
What about the countersink?
A dedicated countersink bit creates a bevel around a drilled hole so screw heads sit flush. Some step drill sets include a separate countersink tool, while others rely on the step bit's own chamfering step. A separate tool gives you more control over depth and angle, especially for precision work.
Frequently asked questions
- What is a step drill bit set used for?
- Step drill bits are designed for drilling clean, burr-free holes in thin materials like sheet metal, plastic, and wood. The stepped design lets you drill multiple diameters with one bit. Adding a countersink allows you to chamfer the hole edge for a flush screw fit.
- How do I choose the right step drill set?
- Consider the material you drill most often. For stainless steel or hardened metals, choose a set with ALTIN coating and M42 cobalt steel, like the Drill Hog® set. For softer materials, a standard HSS set may suffice. Also check the step range—make sure it covers the hole sizes you need. Match the coating and steel type to your hardest common material.
- Can I use a step drill bit without a countersink?
- Yes. The step bit itself creates a smooth hole, and the final step often acts as a chamfer. However, a separate countersink tool gives you a more consistent bevel and works better for countersinking screws in thicker material.
- How do I maintain step drill bits?
- Use cutting oil or lubricant when drilling metal. Clear chips frequently to prevent binding. Store bits in a case or holder to protect the cutting edges. Resharpen or replace when the coating wears or the edges become dull. Lubrication and proper storage significantly extend bit life.
Product facts
- Drill Hog® ALTIN Cobalt M42 Quad Flute Step Drill Bit Set Free Countersink Set: The set includes three spiral flute step bits: 3/16" to 1/2" (6 steps), 1/8" to 1/2" (13 steps), and 1/4" to 3/4" (9 steps). You can drill 28 different hole sizes from 1/8" to 3/4" without changing bits for each size, saving time and reducing bit wear.
Drill Hog® ALTIN Cobalt M42 Quad Flute Step Drill Bit Set Free Countersink Set
