Scotch Box Corner Reinforcement SquaresGive extra strength to new or used boxes. Seal and reinforce box corners with these strong and durable peel-and-stick supports. Provide extra protection and stability-whether for shipping, storing, or moving-to your new or used boxes. Edge reinforcers can be cut to fit different box sizes. Corner reinforcers' pre-cut design fits all corners. Length: 4"; Width: 4".