The Spider Crane: Appearance: A small-sized crane that relies on 4 hydraulic legs for stability (resembles a spider). Task: Reaching "impossible" places (very narrow, elevated roofs, or inside rooms). Movement: Travels on rubber tracks, and passes through normal doors and elevators. Strength: Lifts heavy weights (up to several tons) despite its small size. Operation: Mostly remote-controlled and runs on electricity or diesel.