1. Product Name: Mountain bike chain gauge
2. Product description:
1> marked on the measuring scale
2> 0.75 indicating an end put to the chain has been worn to replace the chain, can also be used, but it needs to be replaced as soon as a new chain
3> 1.0 if the card can also go up, that this recommendation is to replace the chain off, so that the chain will be slipping, especially when hard, otherwise there will be a security risk