Fischer 551349 Glass drill bit Hex shank 1 pc(s)

This glass drill bit is a perimeter-cutting hole saw fitted with a diamond-impregnated rim that abrades through brittle surfaces. When used with a rotary driver, the hexagonal shank holds the tool firmly while the rim grinds the substrate, producing a circular opening with minimal radial cracking. Cooling and light feed pressure are typically applied to manage heat and extend wear life. Common applications include creating service penetrations in glazed panels and cutting openings in ceramic fittings where precise, low-vibration performance is required. The tool’s geometry directs cutting forces to the edge, reducing contact across the face of the workpiece and helping preserve surrounding finishes.