When wall picture frames have double hangers, it can cause headache! Trying to perfectly measure between the two holes so that the picture will hang evenly, can cause even the most patient person to get frustrated. Here's a trick!
Cut a strip of painter's tape so that one end is straight. Place that end on the first hanger and then cut the other end where the second hanger is. Make sure the tape is sitting in the middle of the hanger, where you want the nail to be.
Then take off the tape and place it on the wall where you want the frame to hang.
Use a level to make sure it is straight and then simply place the nails on each end for a perfectly hung picture every time!