3'' PRECISION ADJUSTABLE BORING HEAD w. R8 arbor 12pcs 3/4" carbide boring bars

This set includes 3" precision adjustable boring head with R8 arbor and 12pcs 3/4" carbide tipped boring bars. *  THE WIDE BASE BEARING SURFACE ASSURES MAXIMUM RIGIDITY EVEN WHEN THE BAR HOLDER IS OFFSET POSITION. *  HEAD HEIGHT: 3-5/32" *  2 VERTICAL AND 1 HORIZONTAL HOLES. *  HOLE SIZE: 3/4" *  CENTER DISTANCE BETWEEN HOLES: 1". *  CROSS DIA.: 3/4" *  OFFSET:  1" *  THREAD BACK: 1-1/2"-18 *  WITH REMOVEABLE R-8 SHANK.