The Bondhus is a Set of 7 Hollow Shaft Nut Drivers. Bondhus tools have long been known for their vastly superior quality, strength, durability, and resistance to rust and corrosion. Features: Rubber grip for added comfort. Hex on the shaft for use with a wrench for added torque. Flat on the handle to prevent rolling off a workbench, counter, or table. Bondhus Hollow Shaft Nut Drivers 7-Piece Includes 3/16, 1/4, 5/16, 11/32, 3/8, 7/16, 1/2.