527-381, RS PRO, Stainless Steel Plain Washer, 0.8mm Thickness, M4 (Form A), A2 304, Brand RS Pro, For Screw/Bolt Size M4 (Form A), Material Stainless Steel, Inside Diameter 4.3mm Stainless Steel Plain Washer, 0.8mm Thickness, M4 (Form A), A2 304