Black aluminium box section product code: BR-100x50x2. Top rated supplier to Trade and DIY. ALUMINIUM SECTIONS Mild Steel (Black) Mild Steel box (black) can be used for many different purposes and applications. planter boxes, greenhouses and even animal pens. 6mm Black. Aluminium box sections, also known as square tubes, are hollow, extruded profiles available in both square and rectangular shapes. 6mm - CODE# S1916R. 6 RADIUS ALUM BOX Range of Aluminium Square Box Section. Oct 17, 2013 ยท Aluminium Box Section is one of the most popular products for us here at Metal Supplies. Compare. xqfbzppvxzkajrifqitoasawijnltfgtxjbzgbyjvziuovnzpvvxdavxesxrtxybhrsetmmb