The DBS-22 sharpening jig works with drill bits from ⅛ inch up to ⅞ inch and accommodates any drill bit material, but it must be paired with a low-RPM wet bench grinder.

The jig is nothing more than two 6-inch blocks of wood that are about 2 inches wide. ... They’re surprisingly easy to sharpen, and you only need a few helpful drill-bit-sharpening tools.