The 117mm (4 1/2") Diamond Core Drill Bit is a professional-grade tool for creating clean, oversized holes in brickwork, masonry, and concrete. Ideal for installing ventilation pipes, bathroom fan ducts, flue outlets, and large conduits, this core bit is a must-have for HVAC, electrical, and general building work.

Featuring premium diamond segments, it delivers fast cutting speeds, reduced vibration, and long service life. Compatible with most rotary core drills and suitable for wet or dry use depending on the application.

Reliable, efficient, and built for precision – essential for jobs that demand larger diameter holes with minimal mess.