Black & Decker™ Chuck Key is designed for DeWalt® type 1 DW511B, DW520, DW511K, DW511 1/2", 2 1/2" VSR, DW505, type 2 DW505, DW511K, DW520, type 3 DW505 hammer drills, Porter Cable® type 1 PC650HD, type 2 PC650HD, 1/2" PC70THD speed hammer drills and Bostitch® type 1 BTE140K 7 A 1/2" VSR hammer.