Snapper 6-1249 Single Bag Grass Catcher Kit is designed to fit SNAPPER 38" Lawn Tractors. It helps you collect grass clippings and litter while mowing your lawn. The kit includes a grass bag, frame structure, baffle, chute, and other necessary hardware. The air lifts on the blade tips create a vacuum that lifts the grass clippings and blows them into the bag. The vacuum and air blast can be adjusted by running the engine faster or slower and changing the forward speed of the mower. The cutting deck should be set about 2-1/2" to 3" high for maximum lift.