Pacific Stair Corporation's 400 Series Precast Stair System is a hassle-free and economical solution for apartment building stairs. We provide the engineered connections, stringers, platforms, and rails. The customer assembles the stair system onsite by installing third-party precast treads. Our customers have the freedom to purchase precast treads directly through us for the convenience of an all-in-one package or a la carte from third-party vendors.