Shim Ring / Shim Washer DIN 988Size: PS 3mm ~ PS 170mmSS 3mm ~ SS 170mmMaterial: Carbon Spring steel Mn65 / C67S.Stainless Steel ANSI 420, 304, 316.Surface Finish: Plain, Black Phosphating, Black Oxide, Zinc plating. Size, thickness, style or other specifications can be designed according to your demand.