The 41x21x2.5mm Hot Dip Gal SLOTTED Channel-3m is a 3000 series 41x21mm strut channel, a slimline profile used where a lighter-duty support system is needed. Manufactured in hot-dip galvanised steel, it works with the same range of channel nuts and fittings as the 1000 series, giving a bolt-together support frame without welding.