Hardwall hangers are made specifically for cement and brick walls. Each hanger comes with four sturdy pins that will anchor the base of the hook to the wall.  You will need a hammer to install hardwall hangers. Use 2 hardwall hangers to hang 1 object if you want extra support and have hanging hardware that will accommodate this. If the item you are hanging has a wire-hanger in the back, be sure to consider the slack when determining where you want it to hang. Test this by pulling the center of the wire tight toward the top of your object. Measure from the bottom of the object to where the wire catches. If you are using 2 hardwall hangers, either measure the distance between the two hooks on the back of your object or measure the width of the object you are hanging and divide that number by 3. One of these two methods will determine how far apart you make your marks on the wall. Line the middle of the base up with the mark you’ve made. Hold the hanger still with one hand and tap all four pins in halfway with the hammer. Release your hold on the hanger and check that the hook is in the correct position. Finish by hammering the pins flush to the hook. To avoid getting your fingers bruised, keep your initial taps very light. Once you feel that the pin has taken hold in the wall, release your hold on the pin and strike the hammer straight on the pinhead to finish. Stand back to make sure it is hung straight. Make any adjustments needed and enjoy.

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Write a summary of the previous text in Vietnamese:
Mua móc treo tường đinh ghim chịu lực 25 pao (11 kg). Đánh dấu điểm bạn muốn gắn móc treo lên tường. Dùng búa đóng từng đinh ghim nhỏ vào tường qua các lỗ có sẵn. Gài dây thép hoặc dây treo của vật dụng lên móc.