Sierra 18-8616 O2 Sensor Wrench 2-18 Offset Sierra Marine O2 sensor wrench with a 2-18 offset. Universal Fits 78 O2 sensors Includes 6 and 12 point socket for confined areas 38 Drive, 2-18 offset California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Special Tools Product MPN 18-8616 Product UPC 808282375959