1.Durable and reliable 2. Applicable Scope: Automotive industrycars, truck, bus, construction machinery, wind power generator, agricultural machinery, foundry industry, drilling equipment, shipbuilding, mining machinery, public facilities, railway transportation 3. Product Features: This is a part that connects securely to the mechanical equipment. Gasket reduces pressure, greatly reduces contact area to prevent loosening and protective part and screw 4. Surface treatment: 5 stainless steel Product Specifications: M6 x 18 x 1.610 PCSM6 x 20 x 1.510PCSM6 x 25 x 1.510PCSM6 x 30 x 1.510PCS.