Porcelain Step Tile. Suitable for external use. Certified R-11 Anti-Slip. Black tile with White speckles. Ideal in commercial areas or for domestic situations where slip-resistance is a concern. This is an extremely durable tile and is also suitable for exterior applications. For use on staircases in conjunction with its own matching plain R-11 tile. For external use we recommend Tilemaster floor adhesive, S1 rated and Tilemaster Grout 3000 rated CG2 WA.