ROBERTS® patented 4-in-1 Expansion Joint Spacers lay flat on the flooring and won't tip over while installing floating/glue-down vinyl, laminate or hardwood flooring. They create 1/4”, 3/8” and 1/2" gaps, and can be used for spacing when installing thresholds. Expansion joints create a perimeter between your flooring and walls, and help protect your floors from damage during expansion and contraction in room temperature fluctuations. US Patent No. 12,024,897