Infinite Product Solutions 9/16in Crush Washer Black Steel. With a Black Oxide Finish this washer is made from 304 Stainless Steel and fits many US threaded .40 S&W and 10mm barrels. Specifications for Infinite Product Solutions 9/16in Crush Washer: Manufacturer: Infinite Product Solutions Fabric/Material: 304 Stainless Steel Weight: 0.096 oz Width: 0.82 in Length: 0.82 in Finish: Oxide Height: 0.15 in Caliber: .40 S&W 10mm Auto Features of Infinite Product Solutions 9/16in Crush Washer Provides over 1 full rotation (360 degrees) for proper muzzle alignment Corrosion Resistant Package Contents: Infinite Product Solutions 9/16in Crush Washer Infinite Product Solutions 916-CW-BS: 9/16in Crush Washer Black Steel