This listing is for a box of 100 umbrella style valve stem seals. Part Number: VS-232P Stem diameter: .341" Outside diameter: .750" Guide diameter: .610" Overall height: .562" Material: Poly-Acrylic They are compatible replacements for many 4, 6, and 8 cylinder engines from Buick, Chevrolet, Ford, Pontiac, and Oldsmobile that have 11/32" valves.