Klein Tools Multi-Bit Screwdriver/Nut Driver 10in1 Heavy Duty Black/Yellow. They are made of the highest-quality tempered steel with a torque-proof anchor in the handle. Specifications for Klein Tools 10in1 Multi-Bit Screwdriver/Nut Driver: Manufacturer: Klein Tools Color: Black/Yellow Features of Klein Tools 10in1 Multi-Bit Screwdriver/Nut Driver Multi-bit Screwdriver / Nut Driver with superior torque for tough applications. Interchangeable shaft holds 6 universal tips; converts to 3 nut driver sizes and 1 hex driver. Nut drivers are heat-treated for added strength and improved torque. Cushion-Grip handle provides superior comfort. Contains: 3/16in (5 mm) and 1/4in (6 mm) slotted #1 and #2 Phillips 1/4in (6 mm) 5/16in (8 mm) and 3/8in (10 mm) nut drivers #1 and #2 square-recess 3/8in hex driver. Package Contents: Klein Tools 10in1 Multi-Bit Screwdriver/Nut Driver Klein Tools 32557: Multi-Bit Screwdriver/Nut Driver 10in1 Heavy Duty Black/Yellow