IRWIN® Unibit® 10231 Self-Starting Step Drill Bit, #1 Drill, 13 -Hole Size, 1/8 in Min Hole Size, 1/2 in Max Hole Size Seeds & Bulbs ICC ESR-3201 approved for structural

ICC ESR-3201 approved for structural application

Masonry Chop Saws and Walk Behind Saws

Three-Star Blade

Wires that do require gas run the risk of wind blowing the gas away

IRWIN® Unibit® 10231 Self-Starting Step Drill Bit, #1 Drill, 13 -Hole Size, 1/8 in Min Hole Size, 1/2 in Max Hole Size Seeds & Bulbs ICC ESR-3201 approved for structuralIRWIN Self Starting Step Drill Bit, #1 Drill, 13 Hole, 1 8 in Minimum Hole, 1 2 in Maximum Hole, Step Increments: 1 32 in, 3 3 16 in Overall Length, Hex Shank, 1 4 in Shank Diameter, HSS, Finish: Black Oxide, Applicable Materials: Aluminum, Brass, Copper, Laminate, Plastic, Stainless SteelFeatures: Single flute cutting edge for greater control through steps Hex shank prevents slipping in drill chuck New SpeedPoint tip penetrates faster than previous