General description VEVOR high-quality SBR linear guide rail set includes 2 guide rails and 4 slide blocks. The durable aluminum guide rails feature precise hole diameter and distance, while the SBR slide blocks utilize ball bearings for smooth and unobstructed movement. This set is ideal for various high-load automation equipment and DIY projects, such as CNC routers, 3D printers, and laser engravers. Technical specifications Model Number: SBR20-C 2200L Slide Block Model: SBR20UU Guide Rail Length: 86.6 in/2200 mm Shaft Diameter: Φ20 mm Dynamic Load (per block): 882 N Static Load (per block): 1370 N Material: High Carbon Steel & Aluminum Mounting Hole Distance A: 1.4 in/35 mm Mounting Hole Distance B: 1.4 in/35 mm Slide Block Size (L x W x H): 2 x 1.9 x 1.5 in/50 x 48 x 39 mm Product Dimensions (L x W x H): 86.6 x 3.8 x 2 in/2200 x 96 x 50 mm Package Size (L x W x H): 89.6 x 5.7 x 3.1 in/2275 x 145 x 80 mm Net Weight: 32.8 lbs/14.9 kg Compatibility and accessories 2 x SBR20 2200mm