Bolt-Grip? Fastener Remover 5 Piece Set

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.
Contents: 10mm (3/8"), 11mm (7/16"), 13mm (1/2") 14mm (9/16") and 16mm (5/8").