Two-Bolt Quick-Release Mast Base with Mechanical Universal and classic two pin mast cup. Mechanical joint is easy to attach to wide boards and provides instant drive to race boards. The built in tool allows you to easily and securely attach the base plate to your board. Now you can leave the plate on the board so that you can more quickly connect your rig to the board. This particular model is extra nice for getting those big sails attached to your wide boards.