Klein Tools KTSB01 Step Drill Bit Double Fluted #1, 1/8 to 1/2 Inch with Easy Read Markings and Targets, 3/8 Hex Shank

Amazon

DURABLE COATING: Step bits are coated with aluminum titanium nitride, providing a durability that is 10 times greater than black oxide, ensuring an extended bit lifespan CLEAN CUTS: Two straight flutes on this Step Drill Bit provide chip removal and cleaner cuts SECURE GRIP WITH DURABLE HEX SHANK: The thick 3/8-Inch hex shank prevents rounding out in the drill chuck, providing a more positive grip and secure operation LASER-ETCHED MARKINGS: High-visibility markings are provided for primary hole sizes, making it easy to identify the desired hole size and achieve accurate drilling NON-WALKING DRILL TIP: The fast-starting, non-walking drill tip ensures precise and accurate drilling, allowing for clean and professional results MULTIPLE MATERIAL APPLICATIONS: Suitable for steel (up to 16 gauge), wood, plastic, and aluminum, offering versatility and convenience 13-HOLE SIZES: With hole sizes ranging from 1/8-Inch to 1/2-Inch, this 13-hole Step Drill Bit offers versatility and accommodates various drilling needs, Weight: 0.05 Pounds, Manufacturer: Klein Tools

Radwell UK

STEP DRILL BITS, 1/8" TO 1/2" HOLE DIA, 3/8" SHANK DIA, HIGH SPEED STEEL, 13 HOLE SIZES 4-3/64" STEP LENGTH, 5-5/16" OAL, HEX (MOQ=1, PKG QTY=1)