This is a professional grade Drone payload release device build with high strength aluminum frame and a 0.15S Digital metal gear servo. The 4mm lock bar is controled by the digital servo and can hold up to 18kg payload. This device can be DIY and installed on any suitable drones helicopters or airplanes. 

Payload Limit : up to 18kg (do not exceed your drone's payload limit)

Frame Size:74*35*15mm

Lock bar diameter: 4mm

Digital controller is not included