This 4 x 4 mm aluminum Artiteq clamp hook is specially designed for use with the Classic+ Rail and is only suitable for the 4 x 4 mm aluminum rods. The hook offers a maximum load capacity of 20 kg, providing a sturdy and secure suspension of medium-heavy decorations and artwork. With compact dimensions of 2.6 cm long and 1.5 cm high, this hook subtly stands out while providing reliable support. Perfect for those looking for a stable and unobtrusive hanging solution for on the Classic+ Rail!