GALVANISED SPIRAL DUCT - 1 METRE LENGTH - 100MM Metal spiral ducting tube is 'female' - Fittings such as bends and reducers generally slip inside the duct tube. Non-Standard lengths are available upon request. Stainless steel and perforated versions are available on request. Produced in accordance with DW144 with a zinc coating weight of 275g/m2 to ensure long-life. Weight: 0.6062712205 pounds.