These are available on Small Overall Dimensional size mandrels Mandrels from 3" to 5", or Large 6 1/4" 9" to 16" back reamers have 5 cutters   18" to 20" back reamers have 6 cutters All thread types are available for use with Vermeer, Ditch Witch, American Auger, and other equipment. We have applications avialable. All of our reamers can be rebuilt.                                We have a complete line of retips, plus new and rerun button bits.   If you are looking for quality, a large selection to choose from, quick shipment and well-below dealer prices, you need not look anywhere else.   Click here for the Rock Bit Comparison Chart                                For a quarter of a century, the drilling industry, including major oil companies, has been coming to us for reliable rerun drilling bits. This long relationship is testimony to our customers' satisfaction with our qualtiy, pricing, service, and wide selection.