Special features of the STIHL saw chain; Oilomatic lubrication system; Fine oil path on the drive link of the saw chain allows the chain oil to flow directly into the rivets to reduce the power attenuation caused by friction. Chain oil is gathered in the indentations on both sides of the drive link to further enhance the oil supply to the surface of the guide bar. This increases the potential of the machine as much as possible and reduces the burden on the guide bar. ★Hard chrome coated steel cutters are carefully manufactured from special steel through several processes and the blade is chrome plated for durability. This reduces the number of impressions and maintains sharpness. ★ At the end of the stretching process, all saw chains are subject to stretching. By continuing to pull with certain force, it gives the saw chain, less wear and will extend the life of the saw chain. ★DRIVE LINK HOLES STIHL have a special punching process to create a mirror-like smooth hole on the drive links, precision machined to reduce friction. This allows the saw chain to be extended and the chain movement is smoother for economy use. ★ Hardened Rivets Each Rivet is hardened by high frequency electromagnetic induction and has been specially strengthened to ensure maximum safety