Review on CNCCANEN Linear Rail Guideway SBR12-1200Mm 2X SBR12 Fully Support 4X SBR12UU Bearing Block Slide Shaft Rod Guide For CNC by Tropingzz Cece

First of all, for all the people who think that they are buying high precision CNC parts, you are kidding yourself. There's a reason they're a quarter the cost of parts from Avid CNC or other well-known brands. They are cheap for a reason and should be treated as such. So if you want ultra-high quality, quality-assured engineering parts, buy them. Otherwise stop complaining. These rails fit my needs and the bearings are pretty crappy but for my needs I'll get them working. I also knew what to expect based on the price. If I wanted perfection, I'd spend a heck of a lot more than $40.