BSI-Door Hardware, based in Sioux Falls, S.D., offers sliding and swing patio door handles, rollers, hinges, flush bolts, and related door hardware in a variety of colors and finishes. The company is a subsidiary of the Amesbury Group that is a division of the Laird Group. BSI operates out of its plants in Sioux Falls, S.D., Statesville, N.C., Reno, Nev., and a distribution center in Ontario, Canada. It offers a full-line of window balance designs and also has the capability to customize any product. BSI s product lines include block and tackle and constant force balances for wood, vinyl, aluminum and fiberglass windows.