This door closer includes wood screws, metal screws and drill so it can be mounted on wood or metal doors. Please stick-on instruction on the door for installation guidance. Tools you?ll need: Tape measure Center punch T-square Adjustable Wrench Ladder Screwdriver Safety glasses Level Chosing Our Automatic Door Closer Reasons: 1. Hydraulic designed makes no noise and stable enough. 2. Two-speed adjustments help you control the speed of closing door and protect your door lock. 3. Detailed introduction attached to the products provides you an easy installation. 4. The automatic hydraulic door closer is made of high-quality aluminum with the hydraulic principle to keep your door close. Using Commercial Door Closer Widely: 1. It?s applicable to all doors that are within 80cm-120cm(31?-47.2?) wide and 65kg-85kg(143lb-187lb) weight. 2. Suitable for warehouse door, fire door, gate, office door, residential and commercial doors, etc. and all kind of different material door. Notes: 1. Please be aware that installing a door closer to a light door may cause an open-door excessive force problem, House with children(age under 6) and physically weak people please take this under consideration. 2. If the door and door frame are NOT on the same plane and over 5 cm/1.97? you need a parallel installation piece (included in the package). 3. Please make sure your door weight and width meet our product?s requirements, otherwise it may cause some unexpected problems like hard to open the door(if you install on a very light door) or doesn?t work well(install on a overweight door).4.This door closer doesn't support the hold open function. Package includes: Major Door Closer Body×1; Connecting Rod×1; Swing arm/Retractable rocker/arm pin×1; Support×1; Screw package×1; Dust cover×1; Drill x1; Manual & Fitting Template X1