The Astro Pneumatic Tool Company 1/2 in.; 10pc Anvil O-ring & Retaining Ring (for Astro 1812 Impact Wrench). Compatible with any Ingersoll Rand, Chicago Pneumatic, and Matco Tools 1/2 in.; Standard Impact Wrench. Competitively priced parts with equal reliability.Compatible with any Ingersoll Rand, Chicago Pneumatic, and Matco Tools 1/2 in.; Standard Impact Wrench. Competitively priced parts with equal reliability.