Hollow Round Shank Nut Driver, Tip Size 5/16 in, Bolt Clearance 1 in, Shank Length 2 3/4 in/ OVERALL LENGTH: 6.688 INCHES NOMINAL HANDLE COLOR: YELLOW WRENCHING SURFACE SIZE: 0.312 INCHES NOMINAL SINGLE END FEATURES PROVIDED: HOLLOW SHAFT AND STRAIGHT FLUTED HANDLE WRENCHING SURFACE SHAPE: HEXAGON SINGLE END MATERIAL: PLASTIC HANDLE MATERIAL: STEEL SHAFT