Here is a sturdy unit of extended boring range, capable of peeling off heavy roughing cuts as well 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 direct reading adjusting screw id ground after hardening and a plainly marked dial face in nonreflecting satin chrome allow easy reading and adjustments of 0.01 or less.
All Criterion Boring Heads have threaded backs for use with a variety of shanks.