Universal Angle Monoridge Tiles can be dry fixed or mortar bedded. Technical Maximum pitch for Universal Angle Monoridge Tile is: 44.5° for Stonewold Mk II 50° for Cambrian, Richmond, Saxon and Landmark Slate 52.5° for Mini Stonewold 62.5° for Plain Tiles When used with rigid sarking and counterbattens the maximum pitch is: 44.5° for Stonewold Mk II 50° for Richmond, Saxon and Landmark Slate 55° for Cambrian and Mini Stonewold 65° for Plain Tiles This Monoridge tile is 450mm long.