Brand new 12 Piece Magnetic Nut Driver Set, SAE Metric, 1/4" Hex Shank, Quick-Change, Premium Impact Power Hex Nut Driver Drill Bit Master Kit, SAE 1/4" to 9/16", Metric 8-14mm, Cr-V Steel 12 Piece Magnetic Nut Driver Set {SIZES} - Set includes: (SAE: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16") | (METRIC: 8mm, 10mm, 11mm, 12mm, 13mm, 14mm) {INDUSTRIAL GRADE} - Constructed using High Quality CR-V Steel (Chrome Vanadium Steel) with a Black Phosphate Coating for durability. High Strength, Anti-Corrosion, and Abrasion Resistent to Ensure Consistency. {SPECIFICATIONS} - Nut Setters are approximately 2.6" in Length, long enough to safely lock and hold onto your drill. Firmly fastening or loosening your nuts/bolts everytime. With a 1/4" Quick-Change Hex Shank, save time during projects. Fits most quick change chucks and drills. {FEATURES} - Each Unit is Visibly Marked with their Size. Blow Mold Case also Labeled with Sizing for Proper Storage. Nut setter's Magnetic feature secure and provide better work efficiency, effortlessly install or remove hexagonal nuts and fasterners. Our 12pc Magnectic Nut Driver Set is a convenient set to have, perfect for the Professional or DIY Individual.