OEM STIHL 61PMM3 56 Chain / Loop - * 3/8" larger then 61PMM3 55 (one link) Stihl 61PM3 56 Chainsaw Chain Loop (3/8" x .043) 56 Drive Links, fits 16" bar. USA/ Canada/ Mexico 3610 005 0056 / 3610 002 0056 / 3610 000 0056 ** The difference in Drive Links is personal preference 55 vs. 56 - both work on 16" bar. Most popular chain for MS170 with 16" bar... ** 56 vs. 55 give you 3/8" more space when installing fresh chain. 61PMM3 56 : * most popular saws are MS170, 171, 180, 181, 194 and MS211 6 = 3/8" Pitch 1 = .043" / 1.1 mm Gauge P = Stihl Picco cutter type M M = Mini Micro cutter shape 3 = Single-Humped Drive Link 56 = Number of Drive Links Swiss made OEM chainsaw chain from Stihl. Stihl saw chain is made for the most demanding cutting conditions and is loaded with professional features. Stihl chain has Oilomatic drive link lubrication slots, which funnels oil directly to the rivet to reduce wear. Stihl chain is also pre-stretched at the factory, which helps eliminate excess adjustments during break in periods. This chain has reduced kickback and low vibration features. 61PMM3 is a narrow kerf (.043") low profile 3/8" saw chain designed for lightweight chainsaws and pruning saws. The combination of reduced kickback and low vibration features with improved cutting and boring efficiencies make it a favorite of professional arborists. Stihl 16" 61PMM3 56 Chainsaw Chain Loop (3/8" x .043) 56 Drive Links, 61PMM3 56