This Maillard 5 speed Freewheel Body has specific French thread 34.7mm x 1mm pitch and will only fit French threaded hubs that were used up until the 1980s (when things were becoming more standardised) If you knew that already, then maybe this is something you need for a specific restoration project of a vintage L’Eroica era French bike?? See pictures and measurements to assist you. Bon chance!