The Safe Load OEM Gooseneck Ball is a 2-5/16" tow ball made of high-strength stainless steel with a single gauge that is compatible with the RAM puck system (compatible only with RAM trucks).The Safe Load OEM Gooseneck is the one and only gooseneck hitch with a built-in scale that signals you to adjust your load before you hit the road, resulting in a much safer and enjoyable towing experience. With the Weigh Safe's built-in scale, measuring your tongue weight is as easy as coupling your trailer to your gooseneck hitch. Simply hook up your trailer to the Safe Load OEM Gooseneck Ball just as you would any other gooseneck hitch. The weight of your trailer will push down on the gooseneck ball, which in turn pushes down on an internal hydraulic piston that sits on a bed of oil. When the piston drops into the oil, the pressure reading is sent out to the scale. WHAT'S IN THE BOXSafe Load OEM Gooseneck BallSet of KeysCarrying CaseRubber CoverSPECIFICATIONSCompatibility: OEM puck system (RAM only)Ball: 2-5/16" stainless steelMax GTW: 30, 000 lbs. Max Vertical Weight: 7, 500 lbs. Weight: 16 lbs. Ball Material: High-strength stainless steel Built-in scale signals you to adjust your load before you hit the road Includes keys, carrying case, & rubber cover | Weigh Safe Safe Load OEM Gooseneck Ball Hitch with RAM Chain Anchor Puck for RAM Trucks Only