ZEPHYR Premium Hand Held Dry Core Drill Bits
Vented side wall for air cooling and debris escape. Designed to cut up to 9″ deep, with 5/8-11″ thread that will screw on to your 7″ or 9″ grinder, hand held drill, or insert a Jacobs Chuck Adapter for use in conventional drills. (NOT FOR USE IN ROTARY HAMMER).
Easily drill holes in Block, brick, asphalt, light weight and thin concrete with NO STEEL reinforcement. (NOT INTENDED FOR RE-INFORCED CONCRETE).