An adapter for inserting into a carton containing a non-reel coil of filamentary material or wire has a shaft-receiving sleeve supported by a box structure. The adapter's box structure has top and back walls joined at right angles and reinforced by side walls. Knobs extend outwardly from the side walls and have openings therethrough. Ribs on the underside of the top wall define a channel which is aligned with the openings in the knobs. The ribs, top wall and knobs define a sleeve which is oriented such that it may receive a shaft or rod of a wire pulling rack. Alternatively, said adapter having a box structure with walls only in two perpendicular planes. At least two of said walls forming a channel extending outwardly that may receive a shaft or rod.