... manual button to mold the risk, safe and reliable.FeatureS:1, the machine used to rivet, four claws ... nail 4mm-9mm ( deduction ), 25mm-9mm ( button ) to use.2, using ... for singles and hit two button mode, to adapt to different requirements of the play button.3 ... technology and special processing method, not easy to rust, deformation, durable, can guarantee the smooth ...