25mm Galvanised Conduit id 21mm od 24.6mm supplied in 30m coils. Construction Galvanised single clutch steel conduit. Temperature rating 0 to +300 C. Protection rating IP40. Flammability rating Low fire hazard. Resistance Class 4 heavy 2400 newtons. Mechanical tensile strength Class 4 heavy 1500 newtons.. 30m in length.