1) Semi-Chisel Chain. 3/8"pitch, 050'/058'/063' gauge. 404"pitch, 058'/063' gauge. 2) Made in SKS 51 super Nickel Alloy Material. 3) High Profile Cutters, Sharp Blade, longerChain Life, Pre-added Lubrication before producing, run smoothly, less retractility. 4) Grind chain after assembly, more wearable. 5) The Best Cutting Capability, Better Impact resistance. 6) Slantwise Limit Tooth, Reducing Recoil. 7) Maintain Conveniently, Working With Facility.