URG Underreamer Guage
Well, Foundation and Hole Drilling Tools and Equipment

The Holte URG® (Underreamer Guard) Underreamer has an extendible arm bit and is considered superior to a one-sided UR because three (3) to four (4) arms extend to ream a full gauge (360 degree) hole. The underreamers which swing out on only one side drill slower and not always straight.

This bit design was developed at Holte Manufacturing while researching faster ways to drill large diameter holes. Because there is bit surface reaming the full gauge of  the hole, this bit wears much better than an eccentric style bit which only reams with about a 50 degree portion of  the hole.

The Full Gauge UR resembles a conventional hole opener. The extendible arms cover 360 degrees of the hole circumference, minus three air slots, similar in size to a conventional bit.  We offer URG Overburden Systems between 10" - 42" configured with three (3) or four (4) arms for both conventional and reverse circulation drilling.


URG Underreamer Guage well, foundation drilling tools and equipment

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© Copyright - Holte Manufacturing - Veneta, Oregon. Drilling equipment design, consultation and field applications.

Your #1 source for foundation and well drilling products and tools, Reverse Circulation / RC drilling equipment and drill pipe, Hole Hammers, Casing Drivers, Extractor Hammers, Perforators, Casing Cutters, Top Head Drivers, Air Inlet Swivels, mast modification, Grout Inlets and refurbished drill rigs. We also specialize in Secant retaining wall construction and bridge construction. Please contact us at (541) 935-5054 for consultation or sales questions.

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