The Murray 1721237SM Lawn Mower Cutter Deck Drive Belt helps transfer engine power to the cutter deck for consistent blade operation. This drive belt runs around the deck pulley system, transmitting rotational power to the cutting components during mowing. It is identified as a cutter deck drive belt and is used with lawn mowers and lawn tractors. Replacing a worn, stretched, cracked,... https://www.wholetoolbox.com/murray-1721237sm-lawn-mower-cutter-deck-drive-belt/1721237SM.html