General's Original 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. Engineered to permit sharpening of drill bits to factory accuracy. Extends the life of drill bits. Angle adjustments lock in to grind drill bits for more accurate drilling in a variety of materials. Automatically adjusts to give correct clearance angle. Equally at home in machine shop or home workshop. Instructions included.