Anvil/Hammer Kit Compatible with IR231C / IR231HA / IR2131 - 1/2&rdquo; Impact Wrench Anvil, hammers and hammer pins are an original spec replacement for  drive impacts Anvil Overall Length: 3.670 inches Compatible with IR 231 C / IR 231 HA / IR2131 Includes: 1/2" Impact Wrench Anvil, Front and Rear Hammers, 2-Hammer Pins, O-Ring and Retainer Clip