Spring Lock Washer, Finish Zinc Plated, Material Steel, For Screw Size 10 mm, Inside Diameter 10.5 mm, Outside Diameter 21 mm, Maximum Thickness 2.95 mm, Minimum Thickness 2.95 mm, Color Silver, Material Grade/Class Not Graded, Pack Size Small Pack, Rockwell Hardness C46, Thickness Tolerance +/-0.28 mm, Package Quantity 200