Adjustable width 22-1/2″ to 36″. Set screws secure at desired width. Stainless steel torsion spring closes the gate automatically. Spring is tension adjustable, and reversible. Helps conform to OSHA 1910.29. Powder coated red finish (except spring). Outside tubing 1.37″ OD x 12 gauge wall. Mounting channel is 2″ x 1″ with three mounting holes (hardware not included).