SharperDrills™ Combo Grinder are top quality all metal design drill sharpener. Outstanding reliability, precision and longivety for standard and split point drill sharpening,  plus advanced multi-faceted drill point grinding with Nachi SG-ES point style drill bit sharpening. 2 rake-point grinding with modified X-thinning improves drilling performance overall, saving you money and time. And Nachi SG-ES point drill sharpening is as easy as sharpening standard drills using Sharperdrills ™ Combo Sharpener. After you re-ground only a few twist drills, you sharpen like a pro with these drill grinder machines.