NBB vacuum brazed diamond hole saw with M14, Classic Golden type, drill bit for dry or wet drilling professionally on hard porcelain, ceramic, tile, granite, marble, angle grinder(2, 8mm)

2pcs of Dia.8mm NBB VB diamond drill bIt in Professional Quality with M14 connection, easily connected to Angle Grinder. Standard connection in Europe and UK. Easy operation, applied for DRY or WET drilling, you can work in any conditions. The perfect tools are at your fingertips. You can also do the same great work as a master! Reasonable size designed after thousands of test experience. For dia.5-16mm, approx. 62mm total length with 35mm drilling depth. For dia.18-150mm, approx. 65mm total length with 40mm drilling depth. It meets the vast majority of work needs. Excellent operating experience, low vibration, low noise. USE IT ONCE, LOVE IT FOR LIFE. Extremely high work efficiency, a new generation of diamond technology allows it to drill a hole in TENS OF SECONDS on HARD PORCELAIN, CERAMIC, TILES, GRANITE, MARBLE... Durable and stable drilling life, one NBB VB drill bit for dry drilling dozens holes on HARD PORCELAIN, much longer working life than the electroplated one (almost 8times).. SAVING your money. You can drill much more holes in wet condition.