Made of high-quality materials, size standard, durable and corrosion-resistant, tough, no rust, high precision, smooth surface without burrs, durable Suitable for outdoor and humid environments, used in industrial building materials, home furnishing, marine accessories and sealing straighmotors,cylinders and valves other industries M6 M7 PTFE Washer Gasket Poly Tetra Fluoroethylene Washer High Temperature 0.2/0.3/0.4/0.5/0.6/0.8/1mm Thickness, 100pcs Corrosion resistance, non-stick, self-lubrication, excellent dielectric properties, very low friction coefficient, non-combustible and other characteristics. Usage: Used for micro motor, household appliances, switches, computers, automation equipment, mouse pad.