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Drill Doctor features a patented design that sharpens bits using the same motion used in factories. All of Drill Doctor's models sharpen standard twist and ... The Drill Doctor 500X is designed to sharpen twist bits ranging in size from 3/32′′ to 1/2′′. It works on High-speed Steel, Carbide, TiN-coated and Masonry ... Optional large bit chuck for models XP and 500X. Direct replacement for 750X. Model XP only: also requires a standard replacement wheel for correct ... The top of the line 750X sharpens drill bits from 3/32” to 3/4”. Point angles can be set anywhere from 115 to 140 degrees. The Drill Doctor drill bit sharpening system brings dull bits back to life and is designed to extend the life of twist and masonry bits. Several of you have had good experience with one or more of the Drill Doctor models. I'm intrigued by the Grizzly T34004 Drill Bit Sharpener ( ... I have one of the older "Classic" models that sharpens up to 3/4". I wouldn't recommend it to anyone other than a hobbyist. It worked fine for a couple years. Drill Doctor makes the sharpening of dull and broken drill bits comfortable and quicker. It allows for standard 118° or 135° angle sharpening of various bits. The 750X comes with a second chuck that allows you to sharpen larger bits up to .75 inch. The 750 only has one chuck that can go up to .5 inch. It has worked great over the years and sharpens drill bits very well. The only drill bits that do not sharpen well are HF rubber drill bits.