These barriers are easy to assemble and don’t require holes to be drilled. They simply sit on top of desks and tables. The 3″ rubber grips are included for stability, to keep sneeze guards from sliding, and to ensure surfaces don’t get scratched. Sneeze guards have safe rounded edges and are easy to keep clean. Simply wipe clean with soapy water. We do not recommend using bleach and other chemicals due to the potential for the acrylic to become cloudy. These dividers were designed to act as a protective barrier on each child’s individual desk. Shields ship flat and are quickly assembled by locking each foot into provided notches at the base of the shields.