Product Overview: Suitable for medium to large cranes and port handling machinery working and non-working state wind brake, mechanical lock. Product Features: designed by NC, is de-energized - Safe brake design is reasonable, the dish spring force, smooth and reliable hydraulic loose valve, hydraulic braking torque with a manual override device large, responsive friction material international brand names and seals are more than 0.45 coefficient of friction braking force large and stable, long life factory with limit switch interlock and wear tips.