Flexible Spanner Socket 16MM/21MM T-Bar T-Handle 4-17 Spark Plug Removal Tools. 16mm (5/8") & 21mm (13/16") Sockets fit most Spark Plugs. Spark Plug Removal Tool 16mm & 21mm T-Bar T-Handle. Rubber insert within sockets for spark plug insulator protection and spark plug retention.
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