Klein Tools' Interchangeable Multi-Bit Screwdrivers / Nut Drivers are heavy-duty tools designed for professionals. They are made of the highest-quality tempered steel with a torque-proof anchor in the handle. Strong, durable tips are manufactured with square edges to fit screw openings securely. They resist slippage and provide positive turning action. Stronger nut driver function improves bit-holding power, even with tough applications. TORX Bits €” Phillips Bits #1, #2Square Bits #1, #2 Handle Color Yellow/Black Combo Bits €” Other Bits €” Overall Length 7.891" (20 cm) Weight 7.7 oz (218 g) Nut Driver Sizes 1/4", 5/16", 3/8" Insulated No Slotted Bits 1/4" (6.4 mm), 3/16" (4.8 mm) Number of Pieces 6 Magnetic No Hex Bits 3/8" Shank Length 2.953" (7.5 cm) Handle Material Rubber Handle Type Cushion Grip Bit Retention Quick Change