Features:1. 100% brand new and high quality.2. Made of bearing steel, wear resistant, sturdy and durable.3. Widely used for automatic equipment, precision measuring equipment, and many other machines that need precision linear movement.4. The product has high strength and high toughness, can withstand high speed linear movement.5. Small friction, low noise, run smoothly and stably.Specification:Material: Bearing steelSlide block quantity: 4pcsNuts: BF12/BK12 nutsStatic load ratings: 25.31Fixing bolt size: M4*16mmAllowable static torque: 0.17kNmGuide rail size(L*W): 700*20mm/27.5*0.8inInner hole diameter of plum coupling: 10mm/0.4in, 6.35mm/0.25inPackage Weight: Approx. 6000g/211.6ozPackage List:2 * HGR20-700mm Linear Guide Rail4 * Slide Blocks1 * M1605-700mm Ballscrew1 * Ball Nut1 * BF12/BK12 Nut & Clip1 * Plum Coupling