The Diablo DSD0750S09 3/8 in. to 3/4 in. Impact Step Drill Bit with 9 Steps is built for fast hole making in thin metal, PVC, and other plastic materials. This is a step drill bit designed for enlarging and cutting clean holes in sheet material without swapping between multiple standard drill bits. Model Number: DSD0750S09. If you work in electrical, plumbing, or HVAC and need one bit that can cover several common hole sizes, this is the kind of accessory that saves time every day.

What makes this bit useful on the job is how it combines range and speed in one piece. It cuts from 3/8 inch up to 3/4 inch across 9 steps, with a 1.5 inch drilling depth. That means fewer bit changes when you are opening holes for conduit, fittings, grommets, or pass-throughs in thin stock. Diablo also calls out strict angle tolerances on each step for up to 2X faster cuts, which matters when you are drilling multiple holes back to back and do not want the bit hanging up or slowing down.

The split point tip is a big deal here. Instead of skating across the surface and forcing you to start with a pilot, the tip helps the bit start on target with less wandering. In real use, that means cleaner starts on steel and plastic, less frustration overhead or in awkward positions, and less chance of chewing up the workpiece before the bit even gets going. Diablo also states this design helps deliver up to 6X longer life, which is exactly what you want from a step bit that is going to see repeated use in service work.

Diablo pairs that tip with an optimized dual flute design for jam-free cuts in high-speed drilling. That is not just a nice spec on paper. On a step bit, chip flow and smooth cutting make the difference between a hole that feels controlled and one that grabs at the material. The faster chip clearing and smoother transition from one step to the next help keep your drilling more predictable, especially in lighter gauge metal where chatter can ruin the finish.

This bit is built from high speed steel and uses a 1/4 inch hex shank, so it is ready for both corded and cordless drills as well as impact drivers. That versatility is one of the strongest reasons to buy an impact step drill bit instead of a standard round-shank version. If your everyday carry tool is an impact driver, you can keep working without switching tools. Diablo also claims up to 75% more cuts per charge, which is a real benefit when you are running cordless on service calls or punch-list work.

For trades that work with thin material all day, the application fit is clear. Diablo specifically positions this bit for electricians, plumbers, and HVAC contractors, and that tracks with the size range and material list. It is a smart choice for drilling sheet metal panels, plastic boxes, PVC, and thin steel up to 1/8 inch. If you need a general-purpose step drill bit for fabrication in heavier plate, this is not the right tool for that job. If you need fast, repeatable holes in lighter material with one bit that fits your impact driver, it makes a lot of sense.

Diablo DSD0750S09 Impact Step Drill Bit Gets Right to Work

The Diablo DSD0750S09 is a smart buy for anyone who drills a lot of clean holes in thin metal and plastic and wants impact-driver convenience without giving up control.

• Who it's for: Electricians, plumbers, HVAC techs, and general contractors who need one step bit for common service and install work.
• Why it stands out: The split point tip, dual flute design, and impact-ready 1/4 inch hex shank make it faster and more practical than a basic round-shank step bit.
• Worth knowing: This bit is made for thinner materials, not heavy plate. Used where it belongs, it should save you a lot of bit changes.

• Can this bit be used in an impact driver? Yes. It has a 1/4 inch hex shank and is described as impact ready for use with drills and impact drivers.
• What size range does it cover? It cuts from 3/8 inch to 3/4 inch across 9 steps.
• What materials is it designed for? It is intended for thin metal up to 1/8 inch, PVC, steel, and other plastic materials.
• Do I need to pre-drill a pilot hole? The split point tip is designed to eliminate pre-drilling in many applications by helping the bit start on target.