Plasplugs specialised, Hollow Door Fixings are ideal for fitting coat hooks, name plates and other fixings to the narrow gauge of hollow doors and panels. These tough, compact fixings have a rivet type action gripping the inside of the panel. Expanding wings grip securely in hollow doors, thin skin partitions, plywood and fibreglass. While multi-thread technology ensures superior holding power, this Plasplugs product is ideal for the home, boat and caravan. Accepts No. 6 Screws. Specifications Drill size 6mm. Plasplugs specialised, SDR556 Hollow Door Fixings are ideal for fitting coat hooks, name plates and other fixings to the narrow gauge of hollow doors and panels. These tough, compact fixings, which come in a pack of 20, have a rivet type action gripping the inside of the panel. Expanding wings grip securely in hollow doors, thin skin partitions, plywood and fibreglass. While multi-thread technology ensures superior holding power, this Plasplugs product is ideal for the home, boat and caravan. Accepts No. 6 Screws. Specifications Drill size 6mm. Pack Quantity 20.