General description VEVOR high-quality SBR linear guide rail set includes 2 guide rails and 4 slide blocks, designed for high precision and smooth movement in various automated machines and DIY projects. The durable aluminum guide rails feature precise hole diameters and distances, while the SBR slide blocks utilize ball bearings for unobstructed movement. Technical specifications Model Number: SBR16-C 1500L Slide Block Model: SBR16UU Guide Rail Length: 59 in/1500 mm Shaft Diameter: Φ16 mm Dynamic Load (per block): 774 N Static Load (per block): 1180 N Material: High Carbon Steel & Aluminum Mounting Hole Distance A: 1.3 in/32 mm Mounting Hole Distance B: 1.2 in/30 mm Slide Block Size (L x W x H): 1.8 x 1.8 x 1.3 in/45 x 45 x 33 mm Product Dimensions (L x W x H): 59 x 3.1 x 1.3 in/1500 x 80 x 32.2 mm Package Size (L x W x H): 64.2 x 5.1 x 3.1 in/1630 x 130 x 80 mm Net Weight: 15.9 lbs/7.2 kg Compatibility and accessories 2 x SBR16 1500mm Linear Guide Rails with Supports 4 x SBR16UU