Material is made of 100% 304 stainless steel.The steel can withstand severe weather and temperature changes, including extremely humid areas.Widely used in all kinds of precision machinery industry, classified instruments, meters, electronic products, household appliances, communication products, locks, lamps, toys, cars, bicycles, furniture, etc.Screw Specification: Thread Diameter 8 mm Head Diameter 15.8 mm Head Height 6.2 mm Screw Length 12 mm, 16 mm, 18 mm, 20 mm, 25 mm Allen Hex Drive 5 mm 100% Material 304 Stainless Steel Package contains: (10PCS) M8 x 12 mm (10PCS) M8 x 16 mm (10PCS) M8 x 18 mm (10PCS) M8 x 20 mm (10PCS) M8 x 25 mm Total: 50PCSAny time you need us, please contact us via email or Q&A. We will provide you with professional service and reply to you as soon as possible, you can rest assured to buy..