FenceMaster 1 ½” x 5 ½” PVC Vinyl Fence Open Rail ( Slot Rail ), made of PVC as the main raw material, by high temperature and high pressure extrusion processing. The formula is environmentally friendly, lead-free and has excellent UV resistance. The standard wall thickness of this slot rail is 0.079″, durable, reliable quality. FenceMaster has accumulated almost two decades of experience in the PVC extrusion industry to ensure that our products bring more value to our customers.