Commercial Grade: High quality 201 stainless steel, compact, durable and not easy to rust Size: Suitable door thickness: 25-38 mm / 1 inch - 1.5 inch, maximum door weight 1 piece: 20 kg / 44 lb Adjustable spring force: Provides satisfactory closing speed for a variety of material swing doors. Wide range: It can be used for salon cafe doors, bar counter doors, and store swing doors.