Dewalt, 10 Piece, 3/8" & 1/2" Drive, Impact, Accessory Set, Set Includes: 3/8" Drive Impact Extensions: 3" & 6", 3/8" Drive Impact Universal Joint, 3/8" x 1/2" Impact Increasing Adapter, 3/8" Drive Drill Adapter & 1/2" Drive Impact Extensions: 2.5" & 5", 1/2" Drive Impact Universal Joint, 1/2" x 3/8" Impact Reducing Adapter, 1/2" Drive Drill Adapter.