Each insert comes with a square socket drive and two guide bushings, the nominal size and the 1/16" undersize (except for the 1/4" insert sleeve, as the lower 16th size to this, 3/16", is too weak for this process). The inserts are made of anodized aluminum and the bushings are steel. The same square drive is used for the two sizes of dowel.
This product is restocked on an ongoing basis.
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