Pack of 4 base anchor clips with 4 rust resistant bolts 4 washers 4 plugs and a matching masonary bit for fixing a greenhouse base securely to concrete or patio slabs specially made to fit all our greenhouses but suitable for similar greenhouse basesone pack is sufficient for a 4ft x 6ft greenhouse two packs are required for a 6ft x 6ft and 6ft x 8ft greenhouse a strong hammer action drill is recommended for use on concrete slabs secure fixings for concrete slabs specially developed