Kisankraft Pack of 5 Air Filter Knobs is a high-quality replacement set designed for 2-stroke brush cutters, specifically models KK-BC-555, 7640, and 8640. These durable knobs ensure secure and efficient air filter attachment, enhancing engine performance and longevity. Easy to install and made from robust materials, they are ideal for both professional and home gardening needs, delivering reliable operation in all conditions.