Klein Tools 59005 Step Drill Bit #5 Single-Fluted

The 59005 step bit works in most metals, including steel, brass, aluminum and copper, and also cuts plastic and wood. It is meant for thin sections of material, which is what step bits are built for, so it is a sheet metal, enclosure and panel bit rather than something for thick stock.

For most sizes, no. The 59005 has an anti-skid tip that eliminates the need for center punching or pilot hole drilling. Combined with the single-flute grind, which stops the bit skidding across the surface, it starts on the mark in sheet metal without wandering.

That's the point of it. The 59005 drills multiple-size holes in thin metal, plastic or wood with a single bit, so one tool covers a range of connector and fitting sizes instead of carrying a full index. Each step is laser etched with its hole size, and because the marking is etched rather than printed it stays readable after the bit has been in a pouch for a year.

Single flute, like the Klein 59005, means one cutting edge. Klein calls out two practical results: it eliminates skidding on start, and it is easier to resharpen, so an electrician running a lot of holes can bring the edge back rather than replace the bit. Double-fluted step bits use two cutting edges and are generally chosen for faster cutting; if resharpening and clean starts matter more to you, the single flute is the one to pick.

Order by the number. The one described here is Klein Tools 59005, the #5 single-fluted step bit. Klein's step bits are sold as individual numbered sizes covering different hole ranges, so the model number on the shank is the only reliable way to tell them apart once they are out of the package.

No. It is specified for thin sections of metal, plastic and wood. Step bits cut with the cone shoulder, so on plate the steps bind before the hole is finished. For heavy stock use a standard twist drill or an annular cutter and step up in sizes.