This is one of the smallest heads in the Criterion line featuring a 7/8-20 threaded back. The square design permits an extremely large offset while maintaining a more than adequate bearing surface. The interchangeable bar holder comes with either a 3/8 or 1/2 hole. The dial face of the micrometer adjusting screw is graduated for direct reading, i.e., an advance of .001 on the screw removes .001 from the bore. All Criterion Boring Heads have a rust resistant black oxide finish on the body, combined with a satin chromed bar holder and dial screw.
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