STIHL 23RS66  16-inch ChainSaws Chain Made in Switzerland by STIHL. 16-inch, 66 link, .050 gauge, .325 chain. Chromized cutter teeth for durability. Oilomatic oil channeling grove for better lubrication. Fits: 41, 45, 49, 51, 55, 336, 339XP, 340, 345, 346 XP, 350, 351, 353, 435, 440, 445 and 450e