PATIKIL M10 Finish Countersunk Washer, 10pcs 30mm Dia. 6mm Tall Solid 304 Stainless Steel CNC Finish Cup Washer Flat Screw Head Gasket for Construction. Manufacturer: PATIKIL. Instruction: To install the countersunk washer, simply place it between the screw head and the surface being fastened.

PATIKIL M10 Finish Countersunk Washer, 10pcs 30mm Dia. 6mm Tall Solid 304 Stainless Steel CNC Finish Cup Washer Flat Screw Head Gasket for Construction. Manufacturer: PATIKIL. Instruction: To install the countersunk washer, simply place it between the screw head and the surface being fastened.