ALUMINIUM CHANNEL UNEQUAL U PROFILE 13mm and 20mm internal measurements
Size 1 base =18mm, long leg = 29mm, short leg = 15mm, thickness 2.5mm, channel slot size 13mm. size 2 base =25mm, long leg = 25mm, short leg = 12mm, thickness 2.5mm, channel slot size 20mm. ALUMINIUM IS PRODUCED TO BS EN 755-9.