1. Total Length: 3600mm, 5400mm, 7200mm

2. Leverage Ratio: 2:1

3. Pivot to front measurement length: 2400mm, 3600mm, 4800mm

4. Stiffness: With the center of the shaft hole as the fulcrum, when a load of 200 grams is applied at a distance of 1200 millimeters from the fulcrum, the deflection is not more than 0.05 millimeters.