Sealey AK1621 Long Reach Double End Spark Plug Socket 16 & 21mm Designed for either 16mm or 21mm deep seated spark plugs. AK1621 Features Designed for either 16mm or 21mm deep seated spark plugs 300mm Long with tommy bar AK1621 Specification Model No AK1621 Brand: Sealey Length: 300mm Nett Weight: 0.30kg Size(s): 16, 21mm What is included: 1 x Sealey AK1621 Long Reach Double End Spark Plug Socket 16 & 21mm