Ground Fixing Brackets for Picnic Tables and Benches - one pair of brackets supplied with bolts A pair of Simpson Strong Tie right angle fixing brackets and expansion bolts, for fixing your bench or picnic table into a concrete base. Choose short bolts for fixing to flags or longer bolts for fixing into concrete. Helps prevent anyone from removing your outdoor furniture without your permission. No guarantee is given of course, as certain rascals coming equipped with the right tools can remove anything, but you don't want to give them an easy time. Made from rust resistant steel and with shear nuts, whose outer section will break away once tight, making it near impossible to remove with a spanner or socket set.