3 Piece, Impact Rated Rotary Masonry Bit Set, 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, Contains 5/32", 3/16" & 1/4" Bits.