Application: This chain breaker is fit for 420 428 520 525 528 530 roller chains.. It is widely used to adjust the length of a roller chain for 50cc, 70cc, 90cc, 110cc, 125cc ATVs and dirt bikes, GO Kart, Mini bike, Scooter, Pit Bike, Quad and etc Material: This roller chain breaker is constructed with high quality molybdenum steel which has a higher strength than normal metal material and expand the product lifespan. Design: The surface of the chain breaker is special treated and is corrosion resistant. The chain breaker has a ergonomics design and will make your work much easy. Package: There is one roller chain breaker in the package. Warranty: 30 days free return and 365 days free replacement. If you come across during usage, we are here to help. Application: The 420-530 roller chain breaker is used to adjust 420 428 520 525 528 530 roller chains. And it is normally used for 50cc, 70cc, 90cc, 110cc, 125cc ATVs and dirt bikes, GO Kart, Mini bike, Scooter, Pit Bike, Q