The DEWALT DWA1790IR IMPACT READY Titanium Nitride Coating Step Drill Bit Set is a 3-piece step drill bit set built for drilling multiple hole sizes with fewer bit changes. This is a step drill bit set designed for fast, controlled hole drilling in a range of applications, especially when you are working with an impact driver or rotary drill. Model Number: DWA1790IR. If you do electrical rough-in, sheet metal work, panel work, or general drilling where you need clean size progression, this set makes that job simpler.

What makes this set useful on the job is how the bits are built to start fast and keep moving. Each bit uses a split-point tip that starts on contact, which helps reduce walking and speeds up the first bite into the material. On thin stock and light-gauge material, that is a real advantage because you spend less time trying to center the bit and more time drilling the hole you actually need.

DEWALT also uses a titanium nitride coating over high speed steel construction, paired with a double-spiral flute design. In practical terms, that means better chip removal and longer service life than a basic uncoated step bit. When chips clear efficiently, the bit cuts more consistently and builds less heat. That helps when you are drilling a series of holes and do not want performance falling off halfway through the task.

Laser-engraved step markings are another small feature that matters more than it sounds. On a step bit, being able to read the size quickly saves guesswork and helps you stop at the right diameter without slowing down. That is especially helpful when you are moving between common sizes during install work and need a clear visual reference right on the bit.

The set covers 19 step sizes across the three bits, from 1/8 inch up to 7/8 inch. That broad range makes the DEWALT DWA1790IR IMPACT READY Titanium Nitride Coating Step Drill Bit Set a good choice when you need one compact set to handle several common diameters instead of carrying a pile of individual drill bits. It is the kind of setup that earns space in the service bag because it solves a lot of everyday drilling problems without taking up much room.

The 1/4 inch hex shank is another practical call. It locks into standard impact drivers quickly and securely, so swaps are easy when you are working overhead, on a ladder, or moving from fastening to drilling. DEWALT states this set is optimized for impact drivers and also works with rotary drills, which gives you flexibility depending on how your kit is set up.

This set makes the most sense for electricians, HVAC installers, maintenance techs, metal fabricators, and remodelers who regularly drill clean holes in thin material and need several diameters from one tool. Serious DIY users will get the same benefit if they want a better setup for clean enlargement work, but the real value here is speed and convenience on repetitive jobsite drilling.

DEWALT DWA1790IR IMPACT READY Titanium Nitride Coating Step Drill Bit Set gets the basics right

This is a smart buy for anyone who drills a lot of clean holes in thin material and wants impact-driver convenience without giving up useful size range.

• Who it's for: Electricians, HVAC installers, maintenance crews, and remodelers who need one compact step drill bit set that covers a lot of common hole sizes.
• Why it stands out: The split-point tips, titanium nitride coating, dual flute design, and readable laser markings all work together to make these bits faster and easier to live with on the job.
• Worth knowing: This is a 3-piece set, not a full accessory kit. If you mostly drill thick structural steel, a dedicated solution may make more sense, but for general install work this set is a handy problem-solver.

• Can this set be used in an impact driver? Yes. DEWALT states the set is optimized for impact drivers.
• Will it also work in a regular drill? Yes. DEWALT states it works with rotary drills as well.
• What size range does the set cover? The three bits cover 19 step sizes from 1/8 inch up to 7/8 inch.
• What shank does it use? Each bit uses a 1/4 inch hex shank.