Babylock Upper Serger Knife Fits Models: BLE8, BLE8W, BLE8W-2, Evolve, Evolution Alternate Part Number B4401-01B-OY B4401-03A-OY * Upper Serger Knife * VacSewCenter provides the best protection to keep your vacuum and sewing machine working in prime condition at all times. * Our 100% satisfaction guarantee ensures that you will be happy with your VacSewCenter purchase. We strive to make sure that all of our customers are satisfied and this is why we offer a 7-day money back guarantee. Buyer is responsible for return shipping. * We strive to make sure that all of our customers are satisfied and this is why we offer a 7-day money back guarantee. Buyer is responsible for return shipping.