... thread, metric thread, tapping thread, drilling thread, half thread, full thread etc.2.Head type: Hexagon head ... Phillips, Hex Socket, Torx, Rice character type, One Way etc.MaterialCarbon steel, stainless steel, SS-304, SS-302, Aluminum, Brass, Bronze ... .Testing EquipmentProjecting apparatus, Salt Spray Test, Durometer, and Coating Thickness Tester.WorkforceA group of experienced production technician ...