The Paramount 3-6C Household to Rollei Lock is a heavy duty cord that can be used with Rollei cameras and flashes having built-in spring locking mechanism.A mushroom shaped lock is present at the tip, which helps you to automatically lock into a camera body or flash until you release itThis 5' flash syncro cable can be used with professional flashes that feature dual blade such as Lumedyne, Norman, Braun, Dynalite, Sunpak, and Quantum Radio 4i