Feature:1. The boring head set is main accessories for boring and CNC milling machine2. High quality 40CR material of the product can provide stable performance3. With excellent hardness and toughness, long service life4. Specially treated surface, high hardness and good vibration resistance5. There is a storage box which you can store the tools, convenient to carrySpecification:Item Type: Boring Head SetSystem: SystemMaterial: 40CrSpecifications(optional): NT30-F1-18-12PCS, NT40-F1-18-12PCSBoring Cutter: 12pcsBoring Head Diameter: Approx. 75mm / 3inMaximum Offset: 25mmThread: 1.5"-18Accuracy: 0.0005" Package List:1 x Boring Head1 x Boring Shank12 x Boring Cutter3 x Wrench