Norcros Adhesives Rock Tite Outdoor Tile Grout is an easy to install product which requires no mixing and is simply swept into the grout joints and starts to cure when in contact with air. It's a permeable jointing compound designed for filling joints from 3mm wide between concrete, natural stone and porcelain paving slabs which have been laid onto a solid permeable base using Norcros Rock-Tite Outdoor Tile Mortar. Steel grey is a mid-grey shade.This item is delivered direct to you from one of our suppliers, please see our Terms & Conditions for details.