The MILWAUKEE® SHOCKWAVE Impact Duty™ 3/4" Drive 9/16-1-1/2" Retaining Rings are optimized for 9/16" to 1-1/2" size impact sockets when additional socket retention is needed on 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.