The Stihl 42057041004 V-Belt Pulley is an authentic OEM replacement part designed for Stihl TS series cut-off saws, including models TS 400, TS 410, TS 420, TS 500i, TS 700, and TS 800. This crucial component ensures proper power transmission within the saw's belt drive system. Crafted to Stihl's rigorous specifications, it offers durability and precise fit, maintaining optimal performance and reliability for demanding cutting applications.