EASY DIY PROJECT – Thanks to these Prime-Line KC10HD safety spring door closers, your next to-do is quick and easy. Use these door closers to convert hinged doors to self-closing ones. INCLUDES – (1) Surface mounted spring-loaded door closer, tensioning rod, slide plate and hole plugs to cover adjustment holes in closer body after desired tension has been set. INSTALLATION NOTE – Make sure the closer and tension arm rest on the same plane, not at an angle due to your molding offset. This spring door closer can generate up to 150 pounds of closing force and can be used on both left and right-handed doors adjustment holes in closer body after desired tension has been set. ADJUSTABLE TENSION – Easily adjust the tension on this safety spring door closer. These closers also feature adjustable closing speed. DO NOT adjust more than 4 quarter turns of the tension arm, or spring failure can happen. PRODUCT MAINTENANCE– To alleviate spring noise suggested product to use is wheel bearing grease on spring coils when spring is not under load (no other product suggested) NOTE - This product is rated for 150 pounds of closing force, (weight of door + wind force trying to keep door open) two may be needed to close if you live in a windy area and have a heavy door