Sai commercial corporation supplies drill-grinding jig for sharpening drill bits for cutting tip angles. Other applications include such as 59° general purpose drilling, 88° to prevent snatching on thin materials, 68° recommended high production angle for small drills, 49° for soft materials [copper, lead, some light alloys, etc], and degree countersinking angle. It can be mounted on any bench grinder with simple nut bolt.
