Anodised
M3-M8 Colors Aluminum Alloy Cone Cup Head Washers Gasket Fit for Bolts & Screws
Sizes: M3 M4 M5 M6 M8. -for distributing the load of threaded bolts, screws and nuts, providing a smooth bearing surface. -Standard hole position, uniform force, not easy to slip, easy to use; smooth surface without burrs, high-quality materials, sturdy and durable.