This Kit Includes 4 Anchor Blocks worth £25. 00 , the Anchor Block is an Anchor Assist system that is designed to help secure your building to your ProBase. The Anchor Block will fit into any cell within your ProBase. ProBase Quickfit Shed Bases are designed to provide a firm long lasting base for garden buildings. Each kit comprises a number of super strong, heavy-duty grids made from 100% recycled plastic. Each kit comes with a heavy duty weed resistant membrane cut to size. ProBase are lightweight and simple to install, simply interlock the grids. ProBase is suitable for all garden buildings including timber sheds, plastic sheds, workshops, summerhouses and log cabins. Features: Made from high quality recycled plastic Tested with infill of gravel to over 175 tonnes per grid Includes a sheet of commercial grade weed-resistant membrane, cut to size Manufactured to ISO 9001 in the UK Lightweight and easily picked up, carried and placed into position Robust – provides a firm strong