Spark Plug Socket DH001 Specification:1/2:16mm,21mm;3/8:16mm,21mm productSpark Plug SocketmodelDH001specification1/2",16mm,21mm 3/8",16mm,21mm1/4",16mm,21mmsurface treatmentsatin finishmaterialCr-Vpackagepacked in tool set, or in bulk DH001 Spark Plug Socket