The MTD 954-0371A 42" Deck Belt helps provide efficient power transfer for smooth and reliable mower deck operation. Designed as a replacement deck belt, it transfers rotational power from the engine or pulley system to the mower deck, allowing the cutting blades to rotate consistently during mowing. Proper belt fit and tension help reduce slipping, support steady blade performance, a... https://www.wholetoolbox.com/mtd-954-0371a-42-deck-belt/954-0371A.html