Used on a router sled. I had to set the minimum speed on my 1/4" Dewalt router (8000rpm I think). It worked great at low speed, but when I first tested it felt shaky at higher speeds. If you need an extension like this for 1/4" I would go for it. Just be careful with it as others have said it will break. There aren't many others on the market for 1/4" so it will probably be your best choice.
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