will a single ' saw tooth hanger '. Once the screweyes are affixed to the back of each picture, then lay out your group of pictures on the floor with the smallest gap possible between each item. This may take several attempts before settling on one. And thats a good thing. Better that it happens now, on the floor, than later after you've hung them. With each new layout you like the look of, take a photo of it with your phone camera before re-arranging them again. This gives you several options to revert back to if necessary. Ok, now that you've arrived at the best layout, get that trusty tape measure out and while the frames are still laid out on the floor measure the width and height. Transfer the measurements using pins onto the selected wall. The pins represent the outside dimensions of your group of frames. This is important as it indicates the amount of wall that your group of frames will occupy once up on the wall. This is the time to carefully consider just how high, or to the right or left-of-center that your layout will appear when hung. Get it right. Too low, too high or too far left will mean taking everything down and rehanging again. Begin hanging by selecting the furthest most left frame, based on its height in relation to the top edge of the top frame (highest pin in the wall), measure 1 then transfer that plotpoint 2 using another