Yeh I have been using those exact drill bits, they are very good and served me well over the years.London mike 61 wrote: ↑Mon Oct 11, 2021 6:23 am This is just my personal choice based on what gets the job done with good results and with minimum fuss , but I like to use the Bosch multi material <span class="skimwords-potential">drill bits</span><span style="position: absolute;"></span><span style="position: absolute;"></span>. The reasons are they are sharp and stay sharp because they are hardened in a way that ordinary masonry <span class="skimwords-potential">drill bits</span><span style="position: absolute;"></span><span style="position: absolute;"></span> seem soft by comparison and wear out too quickly IMO.
I would start the initial hole with a small sized bit ( much like a tile/glass bit ) then the size you want.
<span class="skimlinks-unlinked">https://www.screwfix.com/p/bosch-straig ... 5958</span>
<span class="skimlinks-unlinked">https://www.screwfix.com/p/bosch-expert ... 98ky</span>
Mike
I've been doing exactly what you've described, starting with a glass bit then when it seems to not do much more, I switch over to the Bosch multi-purpose bits.
This is why I was thinking maybe it's the drill as there is a chance my spear-shaped/glass bits could be worn but my Bosch bits are definitely not. They do the job eventually but just takes ages. OR I do actually have porcelain or just really tough ceramic tiles.
