This is the Custom Brackets Rapid Fire WT Wireless Transmitter Mount for RF-Pro [CUSCBRF-WT] The Rapid Fire Wireless Transmitter Mount from Custom Brackets is a locking shoe mount for wireless transmitters, designed for use exclusively with the RF-PRO flash-rotating bracket. It has an anti-twist feature. The unit includes the WFM-1 locking shoe, which fits onto the SP-225 D-Clip screw and can be indexed 90°. The mount"s length gives you enough space to position your transmitter next to and level with your flash. Features: Locking Shoe Mount For Use with RF-PRO Flash Bracket Specification: ...Contact us if you need more help.