A dual tenter clip and table assembly for moving, by means of an endless chain consisting of alternating pairs of first chain links and pairs of second chain links rotatably connected by means of pins arranged in parallel to the plane of the rail and perpendicular to the direction of the endless chain's movement, a polymer material web on a stretching plant or stretching device for stretching said polymer material web at least in a transverse direction, said assembly comprising - a main tenter clip body comprising a main tenter clip body carriage having a plurality of wheels (24a, 24b,....) moving the carriage along a rail by means of said endless chain to which the carriage of the main tenter clip body is fixed; - said carriage of the main tenter clip body further comprising a tenter table onto which the polymer material web to be stretched is fixed by a tenter clip; and - said carriage of the main tenter clip body being fixed to a first chain link of the endless chain by means of a vertical pin positioned in parallel to the pins connecting first and second chain links (51, 52) and passing through at least one structural part of the main tenter clip body; and said assembly further comprising - a secondary tenter clip body comprising a secondary tenter clip body carriage, said carriage of the secondary tenter clip body further comprising a tenter table onto which the polymer material web to be stretched is fixed by a tenter clip; and - said carriage of the secondary tenter clip body being fixed to a second chain link of the endless chain by means of a vertical pin positioned in parallel to the pins connecting first and second chain links (51, 52) and passing through at least one structural part of the secondary tenter clip body; - wherein outer walls of said carriage of the secondary tenter clip body on both sides opposite to outer walls of one or two adjacent main tenter clip body carriage(s) are shaped in a manner preventing a contact of said outer walls of the secondary tenter clip body carriage to said outer walls of one or two adjacent main tenter clip body carriages. - a main tenter clip body comprising a main tenter clip body carriage having a plurality of wheels (24a, 24b,....) moving the carriage along a rail by means of said endless chain to which the carriage of the main tenter clip body is fixed; - said carriage of the main tenter clip body further comprising a tenter table onto which the polymer material web to be stretched is fixed by a tenter clip; and - said carriage of the main tenter clip body being fixed to a first chain link of the endless chain by means of a vertical pin positioned in parallel to the pins connecting first and second chain links (51, 52) and passing through at least one structural part of the main tenter clip body; - a secondary tenter clip body comprising a secondary tenter clip body carriage, said carriage of the secondary tenter clip body further comprising a tenter table onto which the polymer material web to be stretched is fixed by a tenter clip; and - said carriage of the secondary tenter clip body being fixed to a second chain link of the endless chain by means of a vertical pin positioned in parallel to the pins connecting first and second chain links (51, 52) and passing through at least one structural part of the secondary tenter clip body; - wherein outer walls of said carriage of the secondary tenter clip body on both sides opposite to outer walls of one or two adjacent main tenter clip body carriage(s) are shaped in a manner preventing a contact of said outer walls of the secondary tenter clip body carriage to said outer walls of one or two adjacent main tenter clip body carriages.