"Terrible product, absolutely not fit for purpose. 1/2 way through first hole and the hardened tips of the bit had sheared off and it was looking like a normal drill bit that had been sharpened to a point. The rest of the pack are going in the bin.
This product is false economy. If you need masonry drill bits the De Walt set are pricier but are money well spent. My 5mm bit is still going strong after over 100 holes in concrete."