&;   These have two main components: the head (H) and the base or tube inlet (TI). For pullboxes of greater height, insertion may be made of spacing rings, E-1 and E-2 (See 3D drawing) The lower part of the tube inlet walls will be thinner so that they can be broken for inserting the tubes. For handling and assembly, all the parts are fitted with two M12x60 threaded inserts for the attachment of the corresponding eyebolts. These pullboxes are used for MT and LT underground cables.      The thickness of their side walls is reduced on the lower part so that, according to the requirements imposed by the type of conduit, they can be broken for the tubes to be inserted. For handling and assembly, all the parts are fitted with two M12x60 threaded inserts for the attachment of the corresponding eyebolts. These pullboxes are used for LT underground cables.