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 you comply with OSHA 1910.29 requirements. Powder coated red finish (except spring). Outside tubing 1.37" OD x 12 gauge wall. Mounting channel is 2" x 1" with two mounting holes (hardware not included). Gate with easy mount kit makes it easy to mount directly on your existing hand rail. Two bolt together clamps hold unit securely to hand rail. No drilling required. FOB Shipping Point.