Premium Materials: Our impact nut driver setter is made of industrial grade chromium vanadium steel, which is strong and durable, and has a black phosphate coating for corrosion resistance. Strong Magnetic: Each nut driver has a high-quality magnet inside to ensure safe lock ​and firmly hold the drill bit when tightening or loosening the nut or bolt. Nut Driver Set Size: This set includes 8 metric sizes: (5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm) and 8 SAE sizes (3/16 , 1/4 , 9/32 , 5/16 , 11/32 , 3/8 , 7/16 , 1/2 ). 1PCS Magnetic Bit Holder Readily Identifiable: Each impact nut driver has clear size markings for ease of use. Easy to Carry: The portable and compact packaging box can be carried with you, making it easy to use. Brand Name LOZAGU Unit Count 1.0 Count Drive System Hex Finish Types Black Phosphate Coated Manufacturer LOZAGU Model Number 17PCS Magnetic Nut Driver (Short) Material Type Chrome Vanadium Steel Number of Pieces 17 Bit Compatibilities Drill Bit, Nut Driver Included Components Magnetic Nut Driver Drive Bit Shank Style Hex Shank Manufacturer Part Number LOZ-NDT017