Features 1、Wide application, suitable for various machine tools 2、Adopt hardened processing, high hardness and long service life 3、Suitable for inner hole iron cutter head, hardened and durable 4、Available in two styles for choice: NT40-1-1/2-18 M16, NT30-1-1/2-18 M12 5、Made of high speed steel material, durable and long service life Specification Item Type: End Mill Tool Holder Optional Style: NT40-1-1/2-18 M16, NT30-1-1/2-18 M12 NT40-1-1 / 2-18 M16: Material: High speed steel Connection Thread With Boring Head: 1-1 / 2-18UNF Applicable Machine: Boring machine Inner Hole: Approx. 16mm / 0.63in NT30-1-1 / 2-18 M12: Material: High speed steel Connection Thread With Boring Head: 1-1 / 2-18UNF Applicable Machine: Boring machine Inner Hole: Approx. 12mm / 0.47in Package List 1 x End Mill Tool Holder