PACKAGE CONTAINS: 20 heavy duty metal self-drill fixings with 20 screws. Plasterboard fixings anchor size: 13 x 31 mm; Screw size: 4.5 x 36 mm. HEAVY DUTY - Heavy duty metal self-drill fixings with screws, provifing strong engagement for use on all types of plasterboard. NO PRE-DRILLING REQUIRED - Simply pierce paper skin and screw home without going through the hassle of finding the drill size to pre-drill holes. Use either a power or manual screwdriver and the screws provided. EASY INSTALLATION: Insert fixing the plasterboard, engage the thread of the self-drilling plug into the board; screw into the plaster board till the fixing is flush with the plasterboard; place the screw in position, insert screw and tighten until secure. MULTI-PURPOSE: Designed for plasterboard walls and dry lined walls, suitable for shelving, bathroom equipment, bracket and hook fixing, picture hanging, cable trunking, etc.