Various self tapping drilling screws Material:Carbon steel Head type: CSK H, PH,HEX H, Truss H. Good quality and prices Many different kinds of screwsChipboard screwsDrywall screwsSelf tapping screwsSelf drilling screwsMachine screwsWood screws Material: carton steel or stainless steel 201,304,316 Length:6mm-100mm full thread or part threadDrive type: Philips, Slot, Square, Combination, Y type, ...