MGN7H Linear Rail Guide Stainless Steel Linear Sliding Guideway with Block for 3D Printer CNC XYZ DIY Engraving Machine 300mm Item Type: Linear Rail Guide Material: Bearing Steel Slider Size: 30.8 x 17 x 6.5cm / 12.1 x 6.7 x 2.6in Basic Dynamic Rated Load: C: 1.37 (k/N), C0: 1.96 (k/N) Allowable Static Moment: MR: 7.64 (N-m), MP: 4.8 (N-m), My: 4.8 (N-m) Sliding Track: Linear Guideway Slider Numbers: 2 Accuracy Grade: H Slider Fixing Mode: Upper Locking Type Features: 1.MGN series is small and lightweight, especially suitable for miniaturized equipment. 2. The material of slider and slide rail is bearing steel, which has the characteristics of bearing steel, non slip and durable. 3. Gothic 4 points contact design, which can withstand the load in all directions, with strong rigidity, high accuracy and so on. 4. There are steel ball keeper design, with interchangeability under the accuracy allowed.