This Rail Installation Kit is suitable for use with both 7" Balustrades. It is not suitable for use in stair applications. This installation kit connects both ends of the 7" rail to two newels. Two kits are needed to accommodate a top and bottom rail. Rail Installation Kits are crafted in urethane, a high-density, non-porous material that offers an enduring resistance against damage caused by water, so the parts will not corrode like metal can or decay like wood. Our balustrade product selection includes both large items and smaller finishing touches.