Hook-and-keeper door holder keeps your trailer / RV door open while you're loading and unloading No need to get a friend to hold the door or find something to prop the door open Ball-socket connection provides added flexibilty when latching and unlatching Durable Polyethylene plastic construction won't scratch up your trailer like metal holders No Screws Included Don’t Let The Door Hit You With Factory RV's T-Style Hook and Keeper Door Holder Details: T-Style Ball Socket Connection Provides Added Flexibility When Latching and Unlatching Durable Plastic Construction Color: Gray Keeps Trailer/RV Door Open Measurements: Arm Length: 4 ½" Round Slot Base Plate: Width: 2 ¼" Length: 1 ½" T Slot Base Plate: Width: 3" Length: 2 ¼"