According to my experience, this router bit is a complete disappointment. The cut quality is poor and it struggles with hardwoods. The only positive is that it is reversible, but that doesn't make up for its overall lack of performance. Save your money and invest in a higher quality tool.
Pros
Reversible design allows for flexibility and convenience in assembly work.
Cons
Requires a specific diameter, limiting its compatibility with certain projects.
When I first made wooden casement windows this tool came in really handy. The tool comes with reasonable instructions and in no time I was set up and had my windows ready.
This is my second Kempston router of the same type. I wanted to use one until the other was sharpened. This one is not good, strong vibration. Unfortunately, the returns window closed and I got stuck with the paperweight.