Review on Sydien Pillow Block Flange Bearing by Jorge Maertz

Re 8mm bearings. I use an 8mm diameter rod that is 7.98mm long. 2 bearings slide well enough, 1 needs pressure to make it slide and 1 doesn't move. I know they are only $9 for 4 so don't expect too much. But be careful, it's very small to make a mistake in the size of the bar and even in this case a little sanding may be needed.