This NSL Profile comprises of an aluminium channel with a choice of insert material for the tread and riser so a stronger contrasting solid band of colour can be achieved.Designed to meet the guidance in Approved Document M and BS8300:2009+A1:2010, ideal for use where no surface floor coverings are used or resilient flooring.When choosing the insert colour(s) then reference should be made to the respective Light Reflective Value of the surrounding floor covering and the stair nosing itself, the difference in these values should be greater than a factor of 30.The profile is supplied Mill finish as standard, other anodised and powder coated options can be made available.External grade Tredsafe Insert. Tredsafe insert is manufactured from a special blend of P.V.C., silica quartz and polymeric plasticiser giving an homogeneous hard wearing anti-slip flooring for wet and dry conditions. The three dimensional pyramid pattern which provides excellent slip resistance in both wet and dry conditions.