Bisley Shelving Bracing Kit to fit your Bisley Shelving Kits and Bisley Shelving Extension Kits. They are fitted to the back of every third unit to create a strong foundation for your storage needs. The use of extension kits and bracing kits allows you to create shelving units that fit perfectly to your space. This Bracing Kit is easy to assemble yourself and requires only one screwdriver to complete, saving you time and effort.