OREGON CHAIN FOR ALPINE CHAINSAW PITCH 21 THICKNESS 1.5 mm Chain adaptable to models: PROF-41 - PROF-45 - P500 - A40 - A40E - PROF41 - PROF45 - P400 - P450 - P500 - P460 - P510 - PRO540 - PRO600 - P522 The chain is available in the following links: - 56 links: length 33 cm - 61 links: length 35 cm - 66 links: length 40 cm - 72 links: length 45 cm - 78 links : length 50 cm OREGON