Disappointing results

I purchased two of these to drill 20 holes in 8mm stainless steel bar. The drill bit was just 5mm, so not that large of a diameter. Working at slow speed on a drill press with constant pressure and using plenty of cutting oil, the first bit broke the cutting edge while drilling the first hole. The second bit was used to finish the first hole and broke the cutting edge on the second hole. I then used an older HSS bit to drill the remaining holes without a problem. Unlike the previous reviewer, these didn't work for me.

Worth the extra cost

These are little short of fantastic. Wanted to drill a number of 10mm diameter holes in 8 and 10mm steel (using a battery electric drill) over 50 in total - all achieved with just one of these drill bits and a little oil. Edges a little blunter now but will still cut without having to pilot with a smaller drill first because of the split point design. I don't think I'll ever bother with ordinary HSS drills again!