Split Lock Washer, Spring Lock, A4 Stainless Steel, Finish Plain, Fits Bolt Sizes M12, M12, Inside Dia. 12.2 mm, Outside Dia. 18.0 mm, Thickness 2.50 mm, Color Gray, General Purpose, For Use With Cylindrical Head Screws, Meets/Exceeds DIN 7980, Package Quantity 50