Centering tip ensures precise guidance of the bit onto a pre-drilled hole.Scoring tips will ensure a clean edge.Titanium coated finish for durability.Diameters:• D 12 - S 8 mm• D 16 - S 8 mm• D 20 - S 8 mm• D 22 - S 8 mm• D 26 - S 8 mm• D 30 - S 8 mm• D 35 - S 10 mm