General Tools 825 Drill Grinding Attachment The General Tools and Instruments 825 Drill Grinding Attachment extends the life of your drill bits by sharpening them back to factory tolerances The angle adjustment gauge allows you to match the point angle of nearly any bit, and even works on countersinks Designed with a pivoting neck for simple grinding of both sides of the bit The Drill Grinding Attachment is intended for use with ANSI, OSHA and UL approved standard electric bench grinders or surface grinders Perfect for both workshop and home use