This Bracket 1 Slide Plate is used for mounting the Sennheiser Evolution Series ew-100 / ew-112 /ew-300 and ew-500 receivers (sold separately) directly to the Bracket 1. The receiver's spring clip slides over the ew clip, locking the receiver in place. In addition, a second receiver can be mounted by adding a Cold Shoe 1 (sold separately) to the side of the bracket. Fits Bracket 1 A, HD2, EX2, C2, mini2, and SLR brackets. Detailed mounting instructions are available on the Bracket 1 website.