Dapetz ® 1/4 'Schacht Rechte Metrische Cutter Router Bits 12mm Lange X 4mm Diameter

Pretty good for the price. Top tip for Router use... turn the speed down.As the flute gets much thinner on small size bits, heat is bad news. There is a tendency for DIY routers to be used at full speed, this is unnecessary and can cause premature wear on the machine as well as blunting/breaking bits.

It may be how I use these, but they do break easily

Excellent for detail routing. As with all slender bits, don’t listen to Rod Stewart here, the first cut should not be the deepest! High speed and shallow will get you a great finish.

The bit I received is silverline. It says that one flute provides a smooth cut. They obviously never used the bit. Single flute bits offer better chip ejection not a smooth cut. For fairly rough work you could use this. I don't think I will be using this but I have learnt about the benefits of different flute formats.