Here is a sturdy unit of extended boring range that is capable of peeling off heavy roughing cuts. It is also a tool of extreme sensitivity. The use of a wide base bar holder that rest 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 is ground after hardening and a plainly marked dial face in non-reflecting satin chrome allows easy reading and adjustments of .001 or less. Criterion Boring Heads have threaded backs for use with a variety of shanks. This model takes a 1-1/2-18 threaded shank.
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