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.