HHIP 1001-0105 3 Piece Boring Tool Set (2 Inch Head & MT3 & 1/2 Inch) Head Size 2"; Shank Taper 3MT Shank To Head 7/8"~20; Boring Bar 1/2"/9pc Boring Head: Bar holder moves freely and smoothly. Design assures superior rigidity for chatter-free boring and precise hole size accuracy. Hardened and Ground adjusting screw designed for long lasting and trouble free use. Tool Capacity Up to 1/2" Tool Capacity Up to 1/2"