Whether you are already fighting the small hive beetle (SHB) or are looking at ways to fortify your hives before they become a problem, this device is the answer. The Beetle Baffle is a highly effective barrier system that installs on the bottom board of your hive. It's easy to install, easy for your bees to get around, and a nightmare for SHBs! Includes a wooden shim for permanent installation on a bottom board. Shim compensates for the vaguaries in nuc hives.