IRWIN 3545973C Lobular Nutsetter Set, Steel, 3-Piece, For Sheet Metal Screws and Hexagonal Head Fasteners

Lobular design reduces stripping damage by driving the fastener on the sides instead of forcing the corners to turn. For use with sheet metal screws and other hexagonal head fasteners. Hex shank of size 1/4 in. Includes one each of 1/4 in, 5/16 in and 3/8 in.