Material: Plastic Thermoplast reinforced Crank body made from plastic. Hub insert: steel, black oxide finish, brass-threaded bush for screwing in the cylindrical handle. Cylindrical handle made from black plastic and revolving. The protruding steel bush ensures an accurate bore and a flush fit of the bore face. It can be retained with a pin or a retaining screw. Version B = with bore H7 Version V = with square bore H11.