This is a detail picture of the wood treads and wood landing on one of our more popular bolt together kit stairs. The treads, # 141, and landing, # 435, are made out the highest quality materials available. The tread and landing thickness is 1" red oak and can be made to any diameter; tread degree or landing shape. We stock kits in a variety of diameters (40, 48, 52, 60, 64 and 72"), this allows us the ability to deliver a standard kit stair in a timely fashion.