T45 89mm Flat Face Retrac Body Dome Button Drill Bit The T45 89mm flat face retrac body dome button drill bit is a threaded rock drilling bit designed for demanding drilling applications in mining, quarrying, tunnelling, construction and rock excavation. Featuring a T45 threaded connection, flat face design, retrac body and dome-shaped tungsten carbide buttons, this drill bit provides a balanced cutting structure for efficient rock penetration and reliable drilling performanc