General description The Mophorn Linear Guide Rail Set is designed for precision machinery, featuring 2 high-quality SBR20 guide rails and 4 SBR20UU slide blocks. Crafted from durable aluminum and carbon steel, this set ensures exceptional accuracy, smooth operation, and long-lasting performance, making it ideal for CNC routers, 3D printers, laser engravers, and various DIY projects. Technical specifications Guide Rail Length: 1000 mm / 39.4 in Slide Block Model: SBR20UU Model Number: SBR20-C 1000L Shaft Diameter: Φ20 mm Dynamic Load (per block): 882 N Static Load (per block): 1370 N Mounting Hole Distance B: 35 mm / 1.4 in Product Dimensions (L x W x H): 1000 x 90 x 36.3 mm / 39.4 x 3.5 x 1.4 in Slide Block Size (L x W x H): 50 x 48 x 39 mm / 2 x 1.9 x 1.5 in Mounting Hole Distance A: 35 mm / 1.4 in Material: High Carbon Steel & Aluminum Net Weight: 7.9 kg / 17.4 lbs Package Size (L x W x H): 1100 x 145 x 80 mm / 43.3 x 5.7 x 3.1 in Package Content 4 x SBR20UU Sliding Blocks 2 x SBR20