Screws, Nails, Rivets manufacturer / supplier in China, offering SL3 SL4 SL5 SL6 pH1 pH2 1/4 Hex Shank 50mm 100mm Slotted Phillips Torx Square Screwdriver Bits, pH0/pH1/pH2/pH4 1/4 Inch Hex Shank Industrial Grade 1/4′′ Magnetic Phillips Screwdriver Bits, Sand Blast E Coating Black Oxide Double End S2 High Torque Magnetic Impact Screwdriver Bits for pH Torx Square Head Screw and so on.