This is a very nicely made boring head with an integral R-8 shank. Finished in black oxide with high contrast white numbers and markings, the dial features graduations in .001" and is direct reading so you bore what you dial! This unit uses 1/2" boring bars, has an offset of 5/8" and comes with setup wrenches. Check out this price! You can't afford not to have one of these on hand! Takes 7/16"-20 drawbar.