Review on High-performance Aluminum Linear Bearing - QWORK SBR20UU by John Clark

A set of similar bearings was lost in transit, the box of bearings and 1200mm rods was opened. These were ordered as replacements. In fact, they are much better than the originals (the second box of bearings and connecting rods arrived successfully). Blocks are machined better, with finer surface finishes. They glide smoothly and as I said in the title, work great.