Product details:

The 4 facet point brings the point to a chisel edge that does not run and drill round, straight holes with tight tolerances. Sharpens all point angles between 90 and 150 degrees. The always same two cutting edges are symmetrically sharpened and work perfectly together, extending the life of the drill bit. A drill holder sharpens drill bits from 1/8" (3mm) to 7/8" (22mm). The optimal free angle can be adjusted to 7, 9, 11 or 14 degrees depending on drilling requirements.