The Lawn Boy 131-9697-03 Lawn Mower Bag Frame supports and holds the grass collection bag in place during mowing. This metal frame fits inside or attaches to the fabric bag on compatible mowers. It works by keeping the bag open and properly shaped, allowing grass clippings to flow in from the deck without collapsing. The rigid structure ensures efficient collection. Replacing a bent or damaged frame restores proper bag support and clean operation.