"I needed a 78mm core drill to drill five holes in 2 inch thick heavy duty paving flags in order to fit uplighters. The only place I could get one quick was Screwfix but I was put off by a bad review. However, I had used Erbauer tools before and found them to be OK so I bit the bullet and bought it. I needn't have worried, the bit made a good job of drilling the five holes and there was still plenty of meat left on the cutting edge when I had finished. The only problem that I encountered was binding of the bit in the hole but I put this down to the fact that I was drilling on a horizontal surface which it made it difficult to get rid of the concrete dust. All in all, very happy with my purchase."
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Review 2 for Erbauer Diamond Core Drill Bit 78mm x 150mm
"First time in ten years of buying parts from Screwfix that I have felt the need to warn people about something they sell.
It may seem that this is value for money, but it did not even complete one hole through a ten inch concrete block before the diamond was worn down to nothing.
Heavy Duty SDS drill capable of drilling this size in concrete, correct speed, pilot drill, square on to block, hammer turned off, no vibration felt from bit - made about 9 inches before it was useless.
If you need to drill this size often then be prepared to pay twice as much for a quality core bit or if less frequently then hire."