Description: 100-1000mm Linear Guide With 2pcs MGN12C Linear Rail Block CNC Tool. Specification: Height (Block): 8mm. Width (Block): 20mm. Length(Block): 28.9mm. Threaded hole(Block): M3*3. Height (Rail): 6.5mm. Width(Rail): 9mm. Length(Rail): 100-1000mm. Bolt Hole(Rail): M3*8. Rolling bearing seat material: Bearing Steel. Shape: Cuboid. Features: - Good quality at a rock-bottom price. - Strong and durable. - The tool is simple and easy to use. - Professional and technical. - Small size, light weight, especially for small equipment. - Slider could easily and lightly move. - With steel ball holder/retainer. Fit for: semiconductor manufacturing equipment; printed circuit board IC assembly equipment; medical equipment; machine arm; precision measuring instruments; office automational equipment; other small linear sliding devices. Package Included: 1 Set x Linear Rail + MGN12C Block(100-1000mm Optional) Or 2 Pcs x Linear Block