IVY Classic Industries, Inc.
IVY Classic Industries, Inc. 09021 11-Hole Step Drill Bit 3/4"–1-3/8
Drills 11 fractional hole sizes from 3/4 to 1-3/8 inches in metal, wood and plastic with a single molybdenum-steel bit
- Drills eleven fractional sizes from 3/4" to 1-3/8" on a single bit
- High-speed molybdenum steel resists wear at high temperature and under abrasion
- Precision-ground bright finish produces round, burr-free holes in material up to 1/8" thick
- Lobular 1/2" shank prevents slipping in the drill chuck
- Laser-marked size steps allow quick identification without a gauge
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.
Highlights
- Drills eleven fractional sizes from 3/4" to 1-3/8" on a single bit
- High-speed molybdenum steel resists wear at high temperature and under abrasion
- Precision-ground bright finish produces round, burr-free holes in material up to 1/8" thick
- Lobular 1/2" shank prevents slipping in the drill chuck
- Laser-marked size steps allow quick identification without a gauge
Specifications
No published specifications for this item yet.
Questions about this item
What shank size does the 09021 step drill bit need for a secure fit?
The 09021 step drill bit has a 1/2" lobular shank that prevents slipping in the drill chuck.
How should the 09021 step drill bit be used to enlarge holes correctly?
Drill a pilot hole first, then use the 09021 bit to enlarge it through the 11 fractional steps up to 1-3/8".
When will the 09021 step drill bit need replacement based on material thickness?
The 09021 bit is rated for materials up to 1/8" thick; cutting thicker stock will accelerate wear and require earlier replacement.
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