Infinite Product Solutions .578in Crush Washer Black Oxide. 578 Inch Black Steel Crush Washer crafted for superior performance. With a Black Oxide Finish this washer is made from durable steel and fits many US threaded .45 ACP barrels. Specifications for Infinite Product Solutions .578in Crush Washer: Manufacturer: Infinite Product Solutions Color: Black Oxide Fabric/Material: Steel Weight: 0.096 oz Width: 0.82 in Length: 0.82 in Finish: Oxide Height: 0.15 in Caliber: .45 ACP Features of Infinite Product Solutions .578in Crush Washer Provides over 1 full rotation (360 degrees) for proper muzzle alignment Corrosion Resistant Package Contents: Infinite Product Solutions .578in Crush Washer Infinite Product Solutions 578-CW-BS: .578in Crush Washer Black Oxide