AVAILABLE TO REGISTERED HUSQVARNA DEALERS ONLY. Ideal for professional users in demanding conditions. High performance,low vibration chain. Chain type H36 (91VG); 3/8'' pitch; .050'' gauge. File size 5/32'' (4.0 mm); 56 drive links. Fits Husqvarna: 136, 137, 141, 142 and 316E. Only fits 137 and 142 with serial numbers before 20061000001.