Astro  1817-1213 1-Inch Anvil O-Ring and Retaining Ring, 10-Piece Compatible with any Astro Pneumatic 1" Standard Impact Compatible with any Ingersoll Rand 1" Standard Impact Wrench Compatible with any Chicago Pneumatic 1" Standard Impact Wrench Compatible with any Matco Tools 1" Standard Impact Wrench Competitively priced parts with equal reliability