This precision boring head is the perfect tool for boring out very accurate holes on a vertical mill or indeed a lathe. The combination of five different sized boring bars and three mounting holes gives a wide range of boring capacities; for example a bar mounted in the central hole will bore from 9mm diameter upwards by 38mm long, whilst a bar in the side hole will bore up to 100mm diameter by about 60mm deep. The movable part of the head can be adjusted down to 0.0005" (0.0127mm) with the aid of the calibrated adjusting screw and a hexagon key. Two mounting arbors are supplied, 2MT and 3MT, both with 3/8" Whitworth drawbar threads. Very useful and excellent value for money. Takes 1/2" shank tools. A set of TCT tipped tooling is available, set number 201000.