[Type]: SK16 Aluminum Linear Motion Rail Clamp Guide Bracket. [Application]: Widely used in 3D printer, multi-axis machine, installed the parts sliders such as industrial machinery. [Precision workmanship]: High-density aluminum alloy structure makes the slider have strong load-bearing capacity and surface oxidation treatment, durable and resistant to corrosion. [High performance]: Smooth movement, low friction, high rigidity, easy to maintain and replace. [Replacement]: Ideal for replacing damaged bearings in your equipment in order to improve efficiency and save energy. 4x SK16 Linear Motion Ball Bearings Model:SK16 Material :Aluminum Alloy Fit Shaft Diameter:16mm/0.63inch Mounting Hole Diameter:5.5mm/0.22inch Distance of mounting hole:40mm/1.57inch Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.