Features 1、Main accessories of boring and CNC milling machine, such as coordinate boring machine, horizontal boring machine and ordinary boring machine. 2、Made of high-quality carbon steel with excellent hardness and toughness, long service life 3、Including 9pcs 12.5mm boring knifes, easy to use and replace 4、This tool set contains boring head,boring shank, perfect for the milling machine 5、There is a storage box which you can store boring cutter, convenient to carry Specification Item Type: Boring Cutter Set Material: 40 carbon steel System: Metric System Specifications: NT30-F1-12-9PCS Boring Head: F1-12 Boring Shank: NT30-1-1/2-18 M12 Boring Knife: 12.5mm Scale: 0.01" Package List 1 x Boring Head 1 x Boring Bar 9 x Boring Knife 3 x Wrench