Description:  300mm Length MGN7 Linear Rail Guide with MGN7H Linear Rail Block CNC Tool.     Specification:  Height (Block): 6.5mm.  Width (Block): 17mm.  Length(Block): 30.8mm.  Threaded hole(Block): M2*2.4.  Height (Rail): 4.8mm.  Width(Rail): 7mm.  Length(Rail): 300mm.  Bolt Hole(Rail): M2*6.  Rolling bearing seat material: Bearing Steel.     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: 3D Printers, 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 x 300mm MGN7 Linear Rail Guide.  1 x MGN7H Block