I bought this for a CNC router. I measured all my end mills before using them and this one came in just under the advertised 1/4". This is not a problem for me, as I always enter the actual diameter of the end mill in my CAM program. I've never found an end mill that exactly meets advertised specs, but I don't buy end mills for more than $100 because the software corrects for diameter inaccuracies for what I do. This end mill works great with hardwoods and plywood. I prefer the straight groove type for wood because I don't have breaks and it leaves a nice clean finish. It is also great for cutting HDPE plastic.
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