50Pack Cup Washer Countersunk Iron Black Countersunk Finish Washers for M6 Screws(M6 ID x 17mm OD x 2mm Thick)

Description 1. [Material] Made of iron high hardness the countersunk head gasket has a smooth surface without burrs. The surface black plating is rust-proof and has anti-corrosion. 2. [Features] The washers can hide the edges of countersunk head screws to create a smooth contact surface which can hide not good-looking holes created by drill bits for a clean appearance decorative appearance. 3. [Easy to Install] The countersunk finish washer is easy to install so that it sits properly between the screw head and the surface of the object being fastened then tighten the screw to hold the washer in place. 4. [Wide Application] Countersunk washers are used in a variety of applications including construction machinery automotive and other industries and can also be used to fasten metal plastic wood or other materials.