HM-05Fit the right fixing for your wall typeSolid brick or block: drill a 6mm hole 45mm deep, insert a red wall plug, and use a 50mm screw. Dot-and-dab plasterboard: the plasterboard is stuck to the masonry with adhesive dabs, leaving gaps behind it, so a short fixing into the board alone will fail — drill through the board and dabs with an 8mm bit and use a long masonry fixing (75-100mm) that reaches and grips the brick or block behind, not just the plasterboard. Timber stud: drill a 3mm pilot hole into the centre of the stud and drive a 5x60mm wood screw directly in, no plug needed. Metal stud: never use a wood screw or plastic plug, as they strip straight through 0.5mm steel — use a self-drilling metal-stud screw or a metal-specific toggle fixing rated for the mirror's weight; if the mirror is heavy, fit a timber noggin between the studs first or fix through to masonry behind if there is any. Lath and plaster: locate the timber laths behind the skim and screw into them with a long screw, or use a spring toggle rated for the weight if you're fixing between laths — avoid loading a single weak point on old, crumbly plaster.