1. High hardness is stronger 2. Quenching and refining, high safety factor 3. Manganese steel chain, forged with high-strength alloy steel, safe and durable

1. Aluminum alloy casing, solid and light. 2. High-precision alloy heat-treated gears, low strength and low noise 3. Waterproof button lock, light and durable 4. Limit switch configuration

1. Iron and aluminum alloy body 2. Sleep/automatic shutdown display keeps 3. Wireless remote control, easy to use