DeWalt® premium carbide percussion hammer bits are used primarily for drilling small diameter holes in masonry, concrete, rock and artificial stone. These bits are used primarily to drill holes for mechanical anchors and fit into standard 3/8 in and 1/2 in chucks. With an innovative tip that reduces walking for improved accuracy. Black+Decker® Masonry Anchor Installation Kit, 10 Piece, Specifications: SDS Plus Shank, For Use With: SDS Rotary Hammers, Carbide Tip, Uncoated