Bluestone External | Bluestone External 10mm |300x600slip rate P5-----------------------Code:OD01022 Add to Idea Basket | Bluestone External 10mm |600x600slip rate P5-----------------------Code:OD01023 Add to Idea Basket | Bluestone External 20mm |600x600slip rate P5-----------------------Code:OD01024 Add to Idea Basket More Info Indicative slip rating – External finish [P5] Variation is an inherent characteristic of tiles and stone. Thickness : 10mm / 20mm.