For sale is a NEW, BORING HEAD R8 SHANK MFG. UKNOWN INCLUDES 1 BORING BAR MADE IN CHINA NEW ADJUSTABLE BORING HEAD WITH R8 SHANK , TAKES 1/2" DIA. BORING BARS , 2 VERTICAL 1 HORIZONTAL 5/8" OFFSET THREADED BACK 7/8"-20 WILL ACCEPT A VARIETY OF SHANKS 2" DIA. HEAD X 2 1/2" OAL. .0005" GRADUATIONS