Wave Spring Lock Washer M6 M8 M10 M12 M20 Stainless Steel Marine Grade 316

M6 (6.5mm ID, 11.5mm OD, 0.5mm Thickness)
M12 (13.2mm ID, 22mm OD, 0.55mm Thickness)
M20 (21mm ID, 35mm OD, 0.7mm Thickness)

Please allow up to 5% measuring deviation due to manual measurement.