Straight Tread Pack for Oak Stair Cladding Oak stair cladding system designed to create the look of a solid Oak staircase, from your existing flight, by providing Oak treads and risers to bond into place over your existing ones. Straight treads are available to purchase in a 1000mm long (which is usually used with standard flights) or a 1220mm long (which is usually used for winder flights). The oak treads are supplied at a 15mm thickness. The treads will suit all stairs with treads up to 286mm deep - this size should be suitable for most UK stairs The tread oak stair cladding system comes with Tread, Riser panel, which are 15mm thick. The risers and tread packs are 1200mm wide. The risers are made by using real oak veneer, which are carefully selected to match the oak treads. They are then bonded to an MDF board which creates a stable riser panel.