I CUT 1/2" 25 DEGREE OFF BOTH TOP CORNERS AND GOT MY YOUNG SON TO TAKE A FILE TO THE TOPEDGES AND ROUND OFF A LITTLE , I USED A FULL 2X4X8 FOR MY ROOST MADE 4 OF THEM FOR MY 16 CHICKENS WHICH MY DROP BOARDS ARE UNDER ROOST ,WHERE I HAVE THE BOARDS CAN BE PULLED OUT FROM OUT SIDE AND CLEANED AND SLIDE BACK IN THIS HAS BEEN WORKING GOOD.