Cimco 142144 is a pulling head bulb with M5 internal thread, sized to fit Ø3.0 mm and Ø4.5 mm glass-fibre fish rods. The bulb rounds the leading end of the rod so it slides through conduit bends and past obstructions without catching. Sold as a spare part accessory. Typical application is cable pulling through conduits and cavities during electrical installation.