Performance Tool W38162 3/8" Dr 5/8" Extra Long Spark Plug Socket Size: 3/8" Dr 5/8" Long SP Socket, Overall socket length: 5 1/8 Socket openings are designed to reduce fastener rounding Chrome vanadium alloy steel construction for strength and durability Polished nickel chrome plated finish resists corrosion Large stamping for quick identification Recessed edges