Designed to enable access through a garage door when there is no power to the motor. Winding Handles can used from both inside and outside. The Outside handle is connected through a connection box that is lockable for security. Technical Details: The Complete kit is supplied with detailed Preparation and Installation Instructions including cutting sizes and parts list: • 7mm Hexagon Drive Shaft to the Motor • Universal Joint & Face Plate (12mm Round to 7mm Hex) • 12mm Round Drive Rod c/w Plastic Sleeve • Internal Winding Handle • Universal Joint & Face Plate 12mm Round to 10mm Hex • 10mm Hex Through Wall Bar c/w Plastic Sleeve & Socket • Lock Housing, Face Plate & Cylinder Lock Set • External Folding 10mm Hex Winding Handle