Feature: High Quality Hardware Made of high-quality hardware and carbon steel hardware, it is sturdy, durable and wear-resistant. Speed Adjustable With two independent valves, you can adjust closing and locking speed speed easily. Easy to Install It is easily installed by installation instructions. Application This Hydraulic door closer works with various types of doors: right and left opened doors, residential door, Commercial Door, wooden door, metal door, fire door, passage door, glass door with frame,hotel door, home and office doors, exterior and interior doors.