Yakamoz 2Pcs 1/4 Shank Top and Bottom Bearing Guide Flush Trim Pattern Router Bit Set Woodworking Cutter Tool with 10 Pcs Top Mounted Replacement Bearings

I tried these out today on a piece of butcher block I am turning into a cutting board. The first one bent and got unstable the second it touched the wood...I am not exaggerating. I tried to use it, but it was too unstable. I loaded the second one into my router and it made it around one long side and one short side and then half way up the other long side before it bent and was no longer usable. I was not putting any more pressure on them than I had to to keep it against my template. These are junk.

The ones I received are are so out of balance they nearly made my Makita trim router shake out of my hand they are that bad. These are too dangerous to use as having one of these fly out of my router has the potential to kill someone? In over 35 years as a cabinet maker I have never had router bits do this but you get what you pay for I suppose? As I got these as low cost units for home DIY use. They have gone striate to the rubbish bin I did keep all the roller bearings as the do fit a lot of my other router bits. I do mot recommend them at all.

Piece of garbage. Only used once on 3/4” oak plywood and it almost hit me in the face. Highly do not recommend.