Metallics NHSD24 High-Speed Twist Drill 24 3-1/8" (10pcs)

The NHSD24 is a No. 24 wire gauge high-speed twist drill with an overall length of 3-1/8 inches. Wire gauge numbering runs opposite to fractional sizing: the higher the number, the smaller the bit, so a 24 is a small-diameter bit used for pilot holes, tapping prep, and sheet metal work rather than for conduit or box knockouts.

Ten bits per pack, supplied in a pouch rather than loose or in an index case. The pouch keeps the set together in a tool bag, which is how most electricians carry wire-size bits between jobs.

Yes. High-speed steel twist drills are the general-purpose choice for mild steel, sheet metal, aluminum, and plastics, which is why the NHSD24 sits in an electrical tool kit alongside screw and anchor hardware. For masonry or concrete you need a carbide-tipped masonry bit instead, and for hardened stainless a cobalt bit will hold an edge longer than plain HSS.

The NHSD24 is sold as a 10-piece pouch, one configuration only, so the pack is the ordering unit. For MRO cribs and service vans that is usually the point: small-gauge bits are the ones that snap most often, and ten gives you replacements on hand.