Complete Repair set: Passive gear, shoes, springs, needle bearings, drive shafts, and seals for a full service solution, ensuring smoothly power transmission and reduced slippage during operate Precisely Fit and Easy Installation: Specifically designed for 135, 135E, 140, and 140E chainsaws ( model 578257101), this drum set ensures perfect compatibility with OEM parts for direct replacement and quick repair without modifications Metal Construction: Made from steel / manganese steel with precisely heat, this 6tooth passive gear resists deformation and impacts, ideal for highly speed chainsaw operations in demanding logging conditions Versatile Forestry Application: A wear part suitable for home trimming, logging, and clearing, with modulars components available for individual replacement to reduce maintenance costs Enhanced Features: Features rust proof surfaces for outdoor durability, evenly tensioned springs for responsive engagement, and precisely engineered tolerances for low noise / vibrations operate, Manufacturer: ljhnba