Do you need a way to keep your puzzle contained on the table? Maybe you need to be able to move it after it is mostly done but you still want to finish it. Now you can with a Dowdle branded Puzzle Tray. They also help when trying to place the borders of the puzzle. Now you can easily build a children's 100 piece puzzle on the carpet! The 16" x 20" fits most Dowdle 100 and 500 piece puzzles. The 19.25" x 26.625" fits most Dowdle 1000 piece puzzles and 500 piece "Best of" series of puzzles. Check your box for the puzzle dimensions.