Review on Rocaris 16-100mm High Speed Stainless Steel Cutting Tool by Will Bremer

Not bad, but you get what you pay for. The supplied spring drills with a center hole are completely useless. The drills weren't even hardened. The center drill literally melted in about 2 seconds on the first hole I tried to cut. I have used many cheap imported drill bits and never seen such bad ones. Luckily, a set screw makes it easy to remove and replace when you need a pilot. The second quality issue is that the teeth do not appear perfectly ground after soldering. Actually they make a group of teeth and solder them, the tooth ends where it ends. This results in fairly poor control of the final size of the hole each saw cuts. The ones I tested were about +/- 0.75mm in diameter from what was advertised for the hole saw. Also, these saws cut stainless steel fairly well and look just as worn.