IVY Classic Industries, Inc. 09021 11-Hole Step Drill Bit 3/4"–1-3/8

11-Hole Step Drill Bit for Conduit Work

This step drill bit covers eleven fractional sizes from 3/4 inch to 1-3/8 inch in a single tool. It is built from high-speed molybdenum steel with a bright finish for wear and heat resistance. The lobular shank prevents slipping in the chuck while laser-marked sizes allow quick identification. Electricians, mechanics and sheet-metal workers will find it practical for enlarging existing holes in metal, wood or plastic up to 1/8 inch thick.

Replaces Individual Bits for 1-Inch Conduit

Instead of carrying separate twist drills for each conduit size, this one bit produces perfectly round, burr-free holes for every standard step up to 1-3/8 inch. The jump is worth it when you repeatedly enlarge pilot holes in thin-wall tubing or sheet metal and want consistent diameter control without changing tools. It is not suited for creating starter holes in solid material or for drilling thicknesses beyond 1/8 inch.

Quick Chucking with Lobular Shank

The 1/2 inch lobular shank locks securely in a standard drill chuck without the slippage common on round shanks. Simply insert a pilot hole at the smallest required diameter, then step through each size in sequence. The cone shape adds rigidity to prevent flexing during the cut. The main mistake is applying excessive feed pressure on the larger steps, which can bind the bit and damage the workpiece.