Genmitsu1/4'' V Grooving Router Bit Set, 60 Degree & 90 Degree CNC Router Bits, 3D V Shape Milling Wood Cutter Knife CNC Engraving Router Bit, VG03A

After reading the other reviews about the 60-degree yellow bits in this set not being properly machined or sharpened, I ordered three sets, hoping that at least one of the yellow bits would be good. Well, it turned out that none of the three were correct. The other bits in the set seem fine, but I've only actually used one of the 'silver' 60-degree cutters so far. I'd have thought Genmitsu/Sainsmart would have tightened up the quality control on the yellow bits by now, given the negative reviews. I guess there are still flawed sets in the warehouses, though. (Although there's three fewer out there now).<<< Update >>>Sainsmart Customer Service reached out to me and are sending replacements for the flawed bits. They were quick to respond and sincere in their efforts to make things right. Good to know that customer satisfaction is still paramount in the corporate ideology of some companies. Great job, Sainsmart!

The 60° bit's tip has not been sharpened.Please, report it to the manufacturer's QC department.P.S. Customer service quickly responded to my review and solved the problem by sending the new parts.

These were either too big or too small for the collet.—UPDATE—Sainsmart Customer Service reached out to me and sent replacements for the flawed bits. They were quick to respond and made more than one attempt to reach me and was very sincere in their efforts to make things right, not only did they replace the router bits they included a set of collets to be on the safe side. Good to know that customer satisfaction still exists Great job, Sainsmart!

These worked great for the project that I was working on. I don't know how durable they'll be in the long run, though. Overall, I'm very satisfied with them.

Just like the headline says the only problem i have is the yellow bit is not sharpened.