This boring head adopts the internal double bearings,guide pad doesn't rotate along with the tool, it has the least wear and the flexible turning. The size adjustment can be achieved by replacing guide stripe or increasing & reducing the shim. The size of cartridge can be adjusted in a certain range. It is very convenient and re-liable.

Cartridge size	Boring bar models	Cartridge size	Boring heads models
Φ32	Φ27	Φ88-Φ107	80
Φ35	Φ30	Φ108-Φ137	100
Φ50-60	Φ43	Φ138-Φ177	100
Φ61-72	Φ56	Φ178-Φ300	160
Φ73-77	Φ65	>300-500	100
Φ78-87	Φ70