OREGON CHAIN FOR EFCO CHAINSAW PITCH 91 THICKNESS 1.3 mm Chain adaptable to models: 131 - 132 - 125 - 3600 - 4000 - MT350 - MT3500 The chain is available in the following links: - 40 links: length 25 cm - 45 links: length 30 cm - 52 links: length 35 cm - 56 links: length 40 cm OREGON