HIPA 25-2 Autocut dual line tap feed Trimmer Head 10mm x 1.0 LHF with Line for STIHL Trimmer # 4002 710 2191 Autocut dual line tap feed Replace manufacturer part number: STIHL 25-2, STIHL 4002 710 2191 Uses .080" .095" or .105" line The item use fine thread: 10mm x 1.0 LHF Won't fit coarse thread 10mm x 1.25LHF, make sure your thread size before order