Proto® Super Proto® Standard Screwdriver, Measurement System: Imperial, Keystone/Slotted Point, 1/4 in Point, 8-1/4 in Overall Length, Round Shank, 1/4 in W Shank, 4 in Shank Length, Alloy Steel Shank, Specifications Met: ASME B107.15, Tri-Lobe, High Alloy Steel, Full Polished