LEGO Technic Tracked Crane 9391 Features moving tracks, rotating superstructure, raising boom, extending arm and raising/lowering hook 2-in-1 model: Rebuilds into a bulldozer Extend the tracked cranes arm, raise and lower the bulldozers blade and lower the bulldozers ripper Tracked crane measures 12 (30cm) high, 4 (10cm) wide and 11 (27cm) long Bulldozer measures 3" (8cm) high, 4" (9cm) wide and 6" (15cm) long