Designed for use in front of open switchboards and high voltage equipment.Provides safety for operatives against electrical shocks.Fine fluted surface to give slip resistance.6mm - recommendefor single-phase, tested to 11kV for 450V rated working.9mm - recommended for 3-phase, tested to 15kV for 650V rated working (conforms to BS921/1976) .10m rolls, or cut to length in multiples of 1m.