WAVEY WASHERS CRINKLE WAVE WASHER A2 STAINLESS STEEL M3 M4 M5 M6 M8 M10 M12- M41. - Material: A2 Stainless Steel. -Grade: A2. the use of electroplating technology, the surface is smooth & burr-free and has good heat resistance, high strength, and high toughness.
eBay