The Reese Model 83002 10" 5th Wheel Lube Plate helps prevent scratches on your fifth-wheel's skid plate and it eases trailer hook-up by letting your trailer king pin slide into place smoothly without the need for messy grease. It also reduces the effect of friction and wear that can be caused by towing. This durable white nylon disk has a diameter of 10" and an approximate thickness of 0.192". It is made to work with standard 5th wheel hitches.