To get the best grinding effect, you should use the No. 1 quality grinding cups(grinding pins) made by SANSUNG company.
Sansung makes and supplies 4 models of grinding cups(grinding pins) as below:
wing(shoulder drive), with 8mm shank/shaft.
san-drive, with 9mm shank/shaft
55-drive
hex-drive
| Button shape | Button diameter |
 round/spherical ballistic water way | 7mm |
| 8mm |
| 9mm |
| 10mm |
| 11mm |
| 12mm |
| 13mm |
| 14mm |
| 15mm |
| 16mm |
| 17mm |
| 18mm |
| 19mm |
| 20mm |
for steel removal | 7-8mm |
| 9-10mm |
| 11-12mm |
| 13-14mm |
| 16-18mm |
| 19-20mm |
Note: when using grinding machine with a collect chuck, the O-ring must be removed.
