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1.LMK12UU Lengthen model square linear bearing Unit made of Steel alloy ,57*32.5*32.5mm(12mm Inner Dia./ 21mm outer Dia). 2.Strong rigidity, abrasion resistance, good parallel movement. 3.Easy to install and use, the screw hole (4.5mm/7.5mm) on the slider is convenient for fixing, reducing vibration and improving shaft sliding. 4.Widely used in 3D printers, CNC machine tools, mechanical rail parts, woodworking/medical/mechanical, DIY experimental mechanical devices, etc. 5.PACKGE INCLUDES:2PCS * LMK12UU Lengthen model square linear bearings.