Upgrade your modern HO Scale industries with the Walthers Cornerstone Platforms and Stairways set of photo-etched brass walkways and work platforms. Designed for easy construction, simply cut, fold and glue. Includes illustrated instructions and features near-scale railings, platforms and open stairways to upgrade your industrial buildings or replace oversize components. The Platforms and Stairways kit can be used on many Cornerstone HO Scale industrial buildings.