The Shure A57F is a break-resistant plastic microphone clip that securely holds a variety of microphones. The A57F replaces the A57D mic clip, and is compatible with the following Shure microphones: KSM137, KSM141, SM63, SM63L, SM63LB, SM81, VP64A, VP64AL, MX412, MX418, MX412S, MX418S, MX412SE, and MX418SE.