The STIHL 39600000068 Rapid Micro (RM) saw chain is a genuine OEM replacement part designed for optimal cutting performance and durability. Featuring a .325" pitch and a 1.6mm (.063") gauge with 68 drive links, this chain is specifically engineered for 45cm (18") guide bars. The Rapid Micro design ensures smooth cutting, reduced vibration, and excellent chip flow, making it suitable for a wide range of felling, limbing, and bucking applications. This high-quality chain provides reliable and efficient operation for compatible STIHL chainsaws, including models MS 260, MS 261, MS 270, MS 271, MS 280, and MS 291.