Product Info Catalog Tools Hand Screwdrivers & Nut Drivers 5/16 x 3.25-In. Round Solid Nut Driver 5/16 x 3.25-In. Round Solid Nut Driver Request a Quote UPC: 52088879245 SKU: 103599 Model Number: 103599 Master Mechanic 5/16" x 3-1/4" Round Solid Nut Driver. Transparent With Yellow Inlay Stripe. Designed for Dependability. Designed for dependability. Solid Shaft with 1" Drilled Recess Beyond Socket Durable Plating for Corrosion Resistance Rugged, Impact and Chemical Resistant Cellulose Acetate Handle Ergonomic 6-flute Handle Design for Comfort and Maximum Turning Power