Durable plastic dust caps that offer valves protection from dirt and corrosion (valves not supplied). Fits most cars, bikes, SUVs, trucks and other vehicles. Caps have an O Ring seal inside them to prevent air leakage from the valve. Features an ergonomic ridged grip design, which makes installing and removing the caps very quick and easy. Plastic Construction Wide Application Airtight & Leakproof 13 x 10mm (L x D) 8mm Thread Hole Diameter Plastic Construction Wide Application Airtight & Leakproof 13 x 10mm (L x D) 8mm Thread Hole Diameter