Check the listing for details. Single One Way Grinder High Precision Punch Pin Former Grinding Machine 3-30mm. Condition: New. Listed at 256.91 USD. Introduction: 1. The punch former is a tool which grinds the standard punching pin head blade(POINT) 2. There is centre hole, the longer punch pin and its body can through it easily and be clamped rasily. 3. Regardless of the circular, the round art. the polygon and so on,each kind of different shape punch cutting edge,according to the equalpart sangle adjustment division,it can complete the angle or the circular art which you need without taking down in process. 4. The accessory arm and angle trimming and diamond tools can easily trim the concave-convex R of grinding wheel,and various forming angles,so it is unnecessary to get other triming tools. Specification: Height of rotation center:80mm 24sub division:sub-degree 15° Clamping diameter in V-solt:3-30mm Clamping up & down in-solt:25mm.