Expert Quality, 6 point deep socket with a rubber insert for plug protection and retention. Manufactured from chrome vanadium steel hardened and tempered with a polished finish. Socket length 65mm. Each socket has a knurled ring for extra grip. Features and BenefitsExpert QualityRubber insert for plug/retentionChrome vanadium steel hardened, tempered, chrome plated and polishedLength 65mm Specifications Thread Size: 14mm Socket Size: 21mm Contents 1 x 14mm Thread 6 Point Spark Plug Socket, 3/8" Sq. Dr., 21mm