Milling Boring Head Set With MT1, MT2 and MT3 Shank Arbor. High Precision Boring Head for Milling Machine of Head Diameter 38 mm. 1MT (Arbor's Drawbar - M6 x 1) Arbor's Mounting Thread - M14 x 1, Arbor's Shank - MT1 / 1MT / Morse Taper 1. 2MT (M10 & 3/8whitworth drawbar) Arbor's Mounting Thread - M14 x 1, Arbor's Shank - MT2 / 2MT / Morse Taper 2. M12 x 1.75 , Arbor's Mounting Thread - M14 x 1, Arbor's Shank - MT3 / 3MT / Morse Taper 3.Capacity with vertical tool - 0-38mm. Maximum boring diameter excluding tool - 60mm. For tooling diameter - 8mm. 1 Division: 0.015 mm. Accepts 8 mm diameter tooling. Supplied with 5 Carbide brazed boring bars. Supplied with 3 pcs round fly cutter set including round toolbits.