1. Material: carbon steel, stainless steel.
2. Diameter: #1/4~3/16 or M4.0~M7.5.
3. Length: 3/8~8" or 25MM~202MM.
1. Head type: hex washer head, hex flange head, flat head, pan head.
2. Drive type: Phillips , torx, phillips/slot, slot. 3
. Thread type: hi-low thread w/3 notches or 5 notches.