Check the listing for details. WORKPRO 39PC Magnetic Nut Driver Set Impact Drill Driver Bit 1/4" Hex SAE&Metric. Color: Blue, Condition: New. Listed at 40.99 USD. Reasonable Set: WORKPRO 39 PCS magnetic nut driver set contains 6 PCS 65mm metric magnetic nut driver(8mm 10mm 11mm 12mm 13mm 14mm), 6 PCS 65mm SAE magnetic nut driver(1/4'' 5/16'' 3/8'' 7/16'' 1/2'' 9/16''), 3 PCS impact socket adapter(1/4'' 3/8'' 1/2''), 10 PCS 38mm metric nut driver(4mm 5mm 5.5mm 6mm 7mm 8mm 9mm 10mm 11mm 12mm), 10 PCS 38mm SAE nut driver(5/32'' 3/16'' 7/32'' 1/4'' 9/32'' 5/16'' 11/32'' 3/8'' 7/16'' 1/2'), 1PCS Magnetic Bit Holder, and 3PCS Screwdriver Bit (PH2). One set is enough for all Premium Quality: All impact nut driver set are made of Cr-V steel, longer service-life, higher shock-resistance. And their surface is electrophoresed, with strong resistance to oxidation and corrosion. Clear size marks on each impact drill nut driver. Three Screwdriver Bits are made of S2 steel, capable of higher torque Easier to Distinguish: The red and blue codes specially designed to quickly distinguish between SAE and metric, as well as the clear laser-etched size, allow users to find the correct-size nut drivers faster; Red for SAE and Blue for metric Upgrade Strong Magnets: 65mm nut driver has a reinforced rubidium magnet with its deep enough interior to securely lock and hold the bits while tightening or loosening nuts or bolts. The nut setter master set owns a universal 1/4" hex shank for quick chucks and any drill or driver, electric screwdriver, socket wrench, pneumatic impact wrench, cordless electric drill, screw gun, etc Easy Storage: Comes with a convenient storage case for easy organization and transport, keeping your tools neatly arranged and readily accessible Brand ‎WORKPRO Material ‎Chrome Vanadium Steel Drive System ‎Hex Finish Type ‎Phosphorizing Blackening Number of Pieces ‎39 UPC ‎820909607175 Manufacturer ‎‎‎HANGZHOU GREATSTAR INDUSTRIAL CO. LTD Item Weight ‎2.53 pounds Package Dimensions ‎8.94 x 8.9 x 2.24 inches Country of Origin ‎China Item model number ‎003132 Size ‎39PCS Magnetic Nut Driver Set Finish ‎Phosphorizing Blackening