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. This 4 quadrant divider was designed to fit perfectly on a 60″ x 30″ rectangular table. (Table Sold Separately.) Shields ship flat and are quickly assembled by sliding tongue and groove pieces together.