The 48466 21RD/21RD & 21RD/21RD Stereo Clips (2 Pack) from Rycote is a set of (2) back-to-back stereo clips designed for use in Rycote 140mm stereo windshield systems with stereo modular suspension. Each unit features a round 21mm diameter hole on its front and back side. Use this set of clips to achieve a custom microphone configuration that matches your existing microphones with the rest of your Rycote setup.