Stihl 18" Chainsaw Chain Loop (23RS 72 Drive Links) 3637 005 0072 Made in Switzerland by STIHL. 18-inch, 72 link, .050 gauge, .325 chain. Chromized cutter teeth for durability. Oilomatic oil channeling grove for better lubrication. Fits Husqvarna 41, 45, 49, 51, 55, 336, 339XP, 340, 345, 346 XP, 350, 351, 353, 435, 440, 445 and 450e