The 15" x 21" Replacement Fiberglass Mesh Leaf Bag is for use with Blue Devil leaf bagger part numbers B5115, B5120X, and B5122X. This durable bag is made from premium fiberglass mesh that offers superior strength and resistance to wear and tear. The mesh material effectively traps leaves, dirt, and other debris, preventing them from clogging your pool's filtration system. Lightweight yet sturdy, it ensures easy handling and efficient cleaning, making pool maintenance a breeze.