Bought these to upgrade an ancient cable drive ShopBot for my guitar-making hobby. For this application they look like they will work great, far better than the screen door rollers and unistrut used on the bot originally, and better than my previous upgrade to v-groove bearings and steel angles. For sure good enough for my occasional woodworking needs. Like a previous reviewer, I received four bearings not listed in the description, so now I have spares! I don_ think I_ put these rails on something that I rely on for a living unless I bought spares, and they seem a little noisy but hey, when the router is running I won_ hear it anyway.
Joachim Haase 
