Put this item on my router table. At first it vibrated like you wouldn't believe it so I made my cut in about 5 cuts because I thought my router was running too fast (because I can't control the speed) porter cable 690, it didn't help at all. I had vibration marks, you won't believe it would take a lot of grinding to use this bit. From that point on, Freida's Will was always a bit boring when it was first unpacked. The seller was great even though I received the product within a few days of ordering.