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Forsun surface set Reaming Shells are set natural diamonds outside of the shells, generally, with the stone size 20/30SPC. The rock cutters are flushed smoothly as the well design of the waterways. 

Usually, we can make two types of Surface set Reaming Shells, one is Spiral Segments Type, the other is Spiral Rib Type. Please refer the following pictures about them.

Spiral Segment TypeSpiral Rib Type