Internal cable routing tool kit, used for threading both inner gear & brake cables through the frame using magnets. Magnets steer & drag the cable end through the frame and around tricky obstacles. Also suitable for electronic wires, Shimano Di2 e-Tube cables, outer brake & gear cable housing & hydraulic brake hoses. For use on aluminium, titanium, & carbon fibre frames. Supplied in a storage case with an EVA foam tray.