Choose between 3/8" Round ( RNGN-32 Sized Inserts) or 1/2" Round (RNGN-43) Cartridge.  Does not include inserts.
 
These cartridges fit the Performance CBN Flycutters, and can be used to retrofit equipment.  This holds the inserts at the correct angle for SURFACING, and Not BORING.   Uses a RNGN Style Insert which is a round cylinder, with cutting edges on both sides typically (Excluding single sided diamond inserts).    Performance CBN also offers a Bi-Metal Cartridge which holds a Conical Insert, with one cutting edge.  These inserts are held at completely different geometry that the standard cartriage, which is used to reduce smearing on Bi-Metal Blocks.  Both are available HERE at Engine Builders Warehouse!