LEM's heavy-duty, non-stick Spring-Loaded Burger Press can be adjusted to any thickness from 1/4" to 1" using the wingnut on the spring. Once you've settled on a thickness, just push the top button down and you've got a perfectly formed 4 3/8" burger patty. You'll never have to worry about mismatched burger sizes again. Use LEM Freezer Sheets (#027A and #027) when making your burgers for easy separation after freezing.