Our U channels are made of aluminium alloy (AlMgSi0,5/EN AW-6060) with mill finish. The U-profile aluminium bars can be easily machined, welded (by TIG or MIG welding technique), anodised and coated. Delivery includes 4 aluminium U channels (each with a length of 197 cm). You can also cut the U-section aluminium bars to your desired length. Note 1): The extruded aluminium channels are sharp-edged; please open the package carefully and wear protective gloves if necessary.Note 2): There might be small scratches on the surface of the U-shaped aluminium strips, which is normal for this type of products.