DryrodSDS Drill Bit - 0.4724" (12mm) Diameter x 11.811"(300mm) Length. Masonry Drill Bit for Damp Proofing, DPC

Hard to find size…glad it was available and it worked great.

I'm in construction and use these types of concrete bits all the time. I needed a 12mm for a home project and all I had was SAE bits made in Germany by Bosch in my drill kit, so I purchased this bit. The Bosch bits all have a fairly decent pointed tip that doesn't wander. This bit is very blunt and wants to wander even with a pilot hole drilled so you'll need to step the hole up to get as close to this size before using it or expect the hole to be off center from where you want it. The kicker was that it also made the hole larger than the 12mm hole I needed. Total bust! You'll get what you pay for....