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 in confirming to OSHA 1910.29 requirements. Powder Coated red finish except spring. Outside tubing 1.37″ OD x 12g wall. Mounting channel is 2″ x 1″ with two mounting holes hardware not included. Can mount on either the left or right side. Gate only swings one way.