2-in-1 Door Guard Model : GT-DG001 Material : Zinc Alloy Weight 210 g Dimension : 100 x 40 x 27.30 mm Suggested Width of Door Frame : 40.5 mm at least Finish : Chrome Plated, Bronze Plated, Antique Bronze, Antique Copper Taiwan Patent No. M565233 (1) Door guard is constructed of thicken solid zinc alloy. It's strong and durable. (2) 3.93" long swing arm folds over the closed door to protect your home security. (3) Unique hidden buckle that locks swing arm in place for secondary security. (4) Easy daily operation: Locks and unlocks easily from the inside in case of emergency.