This is the bracket that slips on the Boat Buckle. It is used to secure a boat cover to the transom. You get a locking bolt from the hardware store and tighten this bracket onto one of the transom bolts. You can also unscrew one of the transom bolts put the bracket in place then tighten the nut back down. I would rather you buy an extra locking nut and leave the motor mount nuts alone. Very simple system to operate. This is the exact same part that several major boat manufactures are using. They will be sold individually.