Proto® Super Proto® Standard Screwdriver, Measurement System: Imperial, Keystone/Slotted Point, 3/8 in Point, 16-3/4 in Overall Length, Square Shank, 3/8 in W Shank, 12 in Shank Length, Alloy Steel Shank, Specifications Met: ASME B107.15, Tri-Lobe, High Alloy Steel, Full Polished