A tool box includes a base having two first holes in two sides thereof, a pivotable part received in the base and having two arms on two sides thereof and each arm having a second hole, and a cover having two lugs located between the two sides and the two arms. One of the methods includes obtaining information identifying flight information of a UAV, with the flight information including flight phase information or a contingency condition associated with a flight critical module included in the UAV. As the workpiece is displaced upwardly, an outer circumferential surface of the workpiece is squeezed by a squeezer projecting radially inwardly from an inner circumferential surface of an outer ring. Different types of representation or levels of abstraction for the routing can be used for the same net or route.