Ingersoll Rand 9512 Air Hammer Quick Change Retainer, Silver Holds 0.401 shank chisels firmly in place; install by pulling back collar Use on Ingersoll Rand 115, 116, 117, 121, and 132 Use on Chicago Pneumatic 0.401 shank hammers expect the CP7 16 Use on Cleco E3, E4, E15, E16 Use on All Dayton Air Hammers