1/4", Impact Rated Rotary Masonry Bit, Rapid Load Provides Quick & Easy Accessory Changes Without Re-Chucking, Accessories Have A Hex Shank Locking System To Prevent Slipping, Holder Fits All Brands Of 3/8" & 1/2" Cordless & Corded Drills, For Drilling In Brick, Block, & Concrete, Carbide Tip Aggressively Penetrates Surfaces.