H.D.H. Instruments is a family owned and operated company specializing in deephole drilling, honing and machining of precision tubes. Established in 1978, H.D.H. Instruments has built a reputation for high quality, and on time delivery. Located in the Houston area, we provide free pick-up and delivery on a daily basis. In addition, we offer 24-hour service, as well as weekends or holidays as required. We look forward to earning your business. We specialize in all types of material including: Alloys, Aluminum, Berrillium, Carbon, Duplex, Hastelloy, Incoloy, Inconels, Monels, Nitronic, Nonmag, Stainless, Titanium, Tool Steel & more… Gundrilling *.078” to 1.500” On-Center Only *Up to 120” long Ejector/Solid Drilling *.950” to 7.250” On-Center & Off-Center *Up to 360” long Trepanning 5.000” to 9.000” On-Center & Off-Center Up to 200” long Honing .0625” to .484” up to 14” long .484” to 1.750” up to 360” long 1.750” to 16.000” up to 600” long Specializing in Honing of Finished Machined Parts, Fine Finishes, Blind End Bores & Double Blind End Bores. Turning General Machine Shop with Turning up to 20” OD Up to 396” long Specializing in Precision Tubes requiring tight Concentricity & Straightness Sawing All materials up to 12” diameter