Jagwire's Pro Internal Routing Tool simplifies routing through a frame, using powerful magnets to safely and easily guide cables, hydraulic hoses and e-shift wires. Constructed from reinforced plastic. LED Flashlight (batteries included). Extendable, flexible, magnet. Soft coated magnet protects the frame finish. Easy to follow detailed instrunction sheet. Retractable, flexible magnet can be inserted into receiving end of a housing run to find the magnetic adapter and easily pull it through. Magnetic adaptor attaches to cables, housing, hydraulic hose, and electronic wires.