The Extreme Max Flip-Up Motorcycle Wheel Chock offers an excellent solution to trailering your motorcycle without sacrificing valuable floor space in your trailer. The flush mount design of the chock keeps it flat to the floor when not in use, which is perfect for multi-purpose trailers while still allowing the permanent installation of your wheel chock. The 16" model offers a recessed dimension of 7.25" wide by 20" long and 2" deep, fitting wheels up to 21" in diameter. Each chock includes a drain hole and drain plug to prevent the chock from holding water and debris while making it easier to keep your trailer floor clean. Installation requires cutting an opening into the trailer floor.