2″ machine packages & 1 1/4″ small bore packages – The unique B&D DTA provides accurate adjustment to the cutting depth of the HSS or carbide tool bit to within a hundredth of an inch. Using the DTA is easy. Just slip it over the tool bit and rest it against the boring bar. Clamp the tool bit to the DTA by tightening the set screw. Zero the dial gauge and release the tool bit from the boring bar. Turning the knurled brass nut pulls the tool bit to the desired length. Relock the tool bit to the boring bar, release the DTA and you’re done. Comes complete with a dial gauge and adjustment blocks to bar diameter. Please contact the order desk for additional details. Models listed below are used with specific machine packages or bore sizes.