For drilling pilot holes and guiding hole saws - The pilot drill for multi-material hole saws is made of ground high-speed steel and guarantees a long service life. The pilot drill for hole saws for brick and soft tile features a tungsten carbide tip for effective drilling through building materials such as brick and soft tile, as well as cement boards and drywall. Hex shank for a strong connection and maximum torque transfer in triple jaw chucks and 1/4" hex socket tool holders