Here is a sturby unit of extended boring range, capable of peeling off heavy roughing cuts as well as a tool of extreme sensitivity.

The use of a wide base bar holder, resting securely on the body, eliminates the need for a separate side plate. You will note this has now become an integral part of the body.

The birect reading adjusting screw if ground affer hard-ening and a plainly marked dial face in nonreflecting satin chrome allows easy reading and adjustments of .005 or less.

All Criterion Boring Heads have threaded backs for use with a variety of shanks. His model takes a 1-1/2”-18 threaded shank.

SHANK SIZE: NT-30,40,50,  MT-3,4,5, R8