Peak Riven Utility Paving Manufacturer: Bradstone Available in three colours Buff, Grey and Red. A cheap, attractive utility slab. Available in a Riven and Smooth finish. NameDescriptionPeak Riven Utility paving Riven 450 x 450 450 x 450mm. Available in Buff and Grey. Riven finish.Peak Riven utility paving Riven 600 x 600600 x 600mm Available in Buff, Grey and Red. Riven finish.