Black & Decker™ Gear is designed for type 1 267261/2", 27205 1/2", 22738 1/2" hammer drill, Type 2 27205 hammer drill, type 100 5075 1/2 hammer drill, DeWalt® type 1 DW505 hammer drill, type 2 DW505 hammer drill, type 3 DW505 hammer drill and Craftsman® 900272051, 90027205 hammer drill, 900272050 drill.