The One-Half Turn Kit can provide a solution to some restricted well opening, entrance, or exit conditions. Minimum well opening 36" x 68". Makes approximately “one-half” turn from top to bottom. 11 risers adjustable from 8'0" to 8'8-1/2". 12 risers adjustable from 8'9" to 9'6". (Shown) 13 risers adjustable from 9'6-1/2" to 10'3-1/2". Additional treads can be ordered for greater heights. Installs either right or left hand up. Metal treads pre-drilled to accept wood coverings. All Metal Spiral Stair Kit accessories available. Please Note: Wood tread coverings should be used with this Kit. For interior use, oak and flakeboard tread coverings are available as an option. You can also cut your own tread coverings by using the paper template furnished on request. Before ordering this stair, be sure to check your local building code. Also, please call us to make certain you have necessary headroom.