Product descriptions from the supplier Overview Structure Specifications 1 Item Number: PT-GD401 2 Travel Range: 60±2 mm 3 Dimension of Platform: 120mm x 80mm 4 Drive Mechanism: Grinding Screw 5 Travel Guide: Slide Rail 6 Stepper Motor (1.8°): SST42D2121 - Stepping Motor with 2-Phases & 1.8° of Step Angle 7 Material Finish: Aluminum Alloy - Black-Anodized 8 Load Capacity: 5kgs 9 Weight: 1.75kgs Accuracy Specifications 1 Minimum Adjust Distance: 5 m Non-MS Driver; 0.25 m/Pulse, 20MS Driver 2 Max Velocity: 5mm/sec 3 Repeatability: 10 m 4 Backlash: 4 m 5 Lost Motion: 3 6 Drop to a low altitude:75mm 7 Rise to high:129mm