I nest the two ( or mine came with 3) sizes inside each other- smallest mesh on the bottom. This year I'll lay cheesecloth inside of it so that after it is done draining I can take the wax still in the cheesecloth and put it inside one of the hives for them to finish cleaning the wax up, they get almost every last drop and leave the wax pretty clean for me! I used to just put the whole screen(s) in the hive but I left it on too long last time and they chewed a hole in it
so I figure I can sacrifice the cheesecloth. Good luck and happy honey harvest!