The MILWAUKEE® SHOCKWAVE Impact Duty™ 3/4" Drive 1-9/16 to 2 & 17mm to 60mm Retaining Rings are optimized for 1-9/16" to 2" and 17mm to 60mm size impact sockets, when additional socket retention is needed for 3/4" drive impact wrenches. The convenient one-piece design and flexible rubber material make the installation of the retaining ring hassle-free. It's necessary to use the proper retaining ring for each socket size.