I used this to cut three large grooves in a slab of cherry wood with a living edge for a mantel. I had no problems with the bit. It is AMAZING value for money. However, towards the end I noticed that a significant amount of the powder coating had chipped off, so I'm not sure how long it will last after multiple uses. Luckily I don't chisel. So if you only groove occasionally I would recommend this attachment, especially if you are just starting out with woodworking. Also, make sure you check your router's recommended speed settings - this resulted in a dramatic change in performance, so like any other tool, it requires a slight learning curve.
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