Features: 1.Scope of Application: Motor limiter can be widely used in rolling shutter doors, garage doors, retractable doors, electric curtains, etc. 2.Efficient: Electric shutter door limiter has high reliability, it works efficiently and with low energy consumption, more convenient to use. 3.High Strength: Electric door limiter is made of aluminum alloy, including full copper motor, high strength, rustproof, long service life. 4.Stable Performance: Optimized circuit design, stable operation of electric shutter motor limiter, suitable for long term work. 5.Simple Installation: Easy wiring and simple operation, no complicated tools required, convenient for using, saving your time. Specification: Item Type: Electric Shutter Door Limiter Material: Aluminum Alloy Gear Diameter: Approx. 64mm/2.52in Gear: 30 Teeth Scope of Application: Rolling shutter doors, garage doors, retractable doors, electric curtains, etc.