Rawl bolt type expansion bolts. Ideal fixings for concrete, stone and brickwork. Heavy duty construction. Many uses around the home & garage including outdoor flood lights, anchor posts, parking barriers, shelving etc. Requires an 14mm hole for the expansive bolt. NOTE:These expansion bolts are not suitable for works requiring Building Control or Local Authority sign-off such as safety rails, balustrades, load bearing joists/ wall plates etc.