Silverline Diamond Core Drill Bit 117 x 150mm 675057

Very good tool, cutting is clean and easy with a good drill.

I did three separate 152mm diameter bores and found it very easy to use (with a decent drill, of course). I was only drilling breezeblock, not shuttered concrete walls.

Semi-pro product bought due to limited budget and only planning to use twice. Turned out to be difficult to use without a pro-level core drill - which of course would normally benefit from a higher-end coring bit. I found I could get acceptable results in certain conditions, alright for occasional use where the quality of the result doesn't matter too much.

I had 5 holes 80 cm deep to make in tufa. The teeth were intact. But I had about 30 cm of concrete to drill, the teeth were worn half. No percussion of course. Used with silverline 650mm trepan door. No problem. Some report a difference in thread between the trepan door and the bit. But no problem for me.

Good value, my only complaint is that it's advertised not as a corer (which it is), but as a hole saw designed to be compatible with certain types of machine. As I result I've struggled to use it for what I wanted. Thanks.

I used this to drill through a concrete slab with a hammer drill. I found it quick and precise, just needed lubricating with a little water. I don't know how long it'll last as I've only done two holes with it so far! But I'd definitely recommend it considering the price.