When you need reassurance that your books and ornaments are held securely, let this Gripit kit help you out. This shelf Kit provides you with all the fixings you need to fit that shelf with ease. It supports heavy loads, suitable for use in 9.5mm to 15mm thick plasterboard. Suitable for dry lined / dot and dab wall constructions, double-thickness and foam-backed boards. Contains: 4x red fixings, 4x screws (5mm x 30mm ) and flat drill bit (18mm). Safe load weight: 74kg. Max load weight: 148kg. Fixing diameter: 18mm. Substrate thickness: 15mm. Minimum edge distance: 24mm.