Lube discs prevent friction and also act as a cushion and vibration barrier between your hitch head and RV without grease. They prevent scratches to the hitch head and make coupling to the trailer smoother. Easily fits on any standard kingpin. Easily Fits On Any Standard Kingpin Reduces Wear And Tear On 5th Wheel And Pin Box When Towing Eliminates Messy Grease On Hitch And Trailer Pin Box Constructed From High Strength Polyethylene Retail Box Of 10 Units Wrapped For Individual Sale Attributes: GTIN: 00880268192040 Brand Name: Husky Towing Estimated Install Time (Hours): 0.25 Grease Required: No Material: Polyethylene Packaging Language: English Quantity: Set Of 10 Size: 10 Inch Extended Information: Country of Origin: TW Emissions : CARB Eligible Life Cycle Status: Available To Order Packing Information: Quantity of Each: 1 Package UOM: EA Dimension: 9.06 x 11.42 x 3.54 inches Weight: 5.36 lb