1.S2 screwdriver bit,bits ph2, 2.material:S2 steel 3.surface:Sandblast 4.passed ISO9001 and GSG 5.high durability s2 screwdriver bit,bits ph2,driver,tool1. Material: S2, Cr-V 6150, 8660 2. Torsion:reduce breakage and high durability3. Surface treatment: sand blast, phosphating red, Cr-coating, nickle plating, or any other special finishes be required by customers4.Type:single head5.Head types: ...