The Cordes Machine Stair-Clamp™ is a valuable tool for box stair construction. Assemble finished stairs ready to install in minutes. Stair assembly has never been easier! Insert stringers, treads & risers; glue wedges and blocks; add nails or screws and you are done! Most users report a 9-minute assembly time for a typical box stair. This machine is solely pneumatic and built rough & tough to last a lifetime. All steps align true and square to stingers without separating as wedges are driven in. Stair-Clamp™ is available in various lengths.