Microcrane’s M1 Global Model Microcrane helps install curtain walls from the exterior of buildings to minimize large crane rentals and speed up production. The M1 Global design fits through 36-inch doorways, narrow aisles and inside elevators, and expands to boom up to a 22-foot tip height. The multi-purpose lifting crane has several configurations, including a rooftop configuration allowing floor-to-floor or ground-to-roof lifting of materials of up to 7 stories.