Irwin 10504634 5 Piece Bolt Grip Base Set (394001)

All have 3/8 square drive and outside hexagon for use with sockets and spanners. Manufactured from carbon steel for durability. Grips fasteners that are rounded off, painted over or rusted tight. Overall length: 27mm. 5 Piece Contents: 3/8, 7/16, 1/2, 9/16 and 5/8.