The Murray 420613 is a genuine OEM tension pulley designed to maintain optimal belt tension in various Murray lawn mowers and garden tractors. This critical component prevents belt slippage, ensuring efficient power transfer to the cutting deck or drive system. Constructed from durable materials, it offers reliable performance and extends the lifespan of your equipment's drive belts. Key dimensions include an outer diameter of 114.3 mm, an inner diameter (bore) of 15.875 mm, and a width of 25.4 mm.