A set of linear ball bearings type LM UU for moving mechanisms along cylindrical guides. This type of bearing is widely used in the construction of 3D printers, laser and engraving machines. Dimensions: LM8UU; LM10; LM12UU; LM13UU; LM16UU; LM20UU; LM25UU; LM30UU; LM35UU; LM40UU; LM50UU. The price is for a set, if you need a specific size of the support, write, I will be happy to help.