SWA-16-20-5-AWEL NBK Adjust Metal Washer - Steel - Electroless Nickel Plating Made in JapanSWA 16 20 5 AWEL NBK Adjust Metal Washer Steel Electroless Nickel Plating Made in Japan Pack of 10 Washer NBK Made in Japan Characteristics: There is a variety of outside diameters and thickness relative to normal plain washers. For securing seating surface on the long hole position and engagement of materials with low marginal seating surface pressure such as aluminum and resin. As a collar and a spacer, it can adjust the cumulative error in