Precision Micro Boring Head 1.5" Head Diameter with MT2 (M10 x 1.5 Drawbar) shank without HSS cutting tool bits Standard 1 Division: 0.001 thou. Accepts tooling of diameter 5/16" Has 2 bores to accept vertical tooling & 1 offset for reaching maximum bore diameter This product is the main accessory of boring machine and CNC milling machine, such as jig boring machine, horizontal boring machine and ordinary boring machine. The boring tool can be used to process inner hole surfaces, boring holes, outer ring boring, boring end faces, boring stepped holes, boring end faces, cutting holes and outer ring grooves.