AB-05Drill and fit the right fixing for your wallSolid brick or block: drill a 6mm hole 45mm deep with a masonry bit on hammer setting, fit a brown wall plug, and use a 40-50mm zinc screw. Timber stud: drive a wood screw straight into the centre of the stud, never into the plasterboard between studs. Metal stud: never use a plastic wall plug or an ordinary wood screw, as it strips straight through 0.5mm steel — use a self-drilling metal-stud fixing or a toggle-type hollow-wall anchor rated for the mirror's weight, and if the mirror is genuinely heavy or top-heavy, fit a timber noggin between the studs first or fix through to the masonry behind instead. Dot-and-dab: use a fixing long enough to pass through the plasterboard and adhesive dabs into the solid masonry behind, typically 75-100mm, with a plug sized for the masonry hole. Lath and plaster: drill gently to avoid cracking the old plaster, and use a fixing long enough to bite into the timber lath and the masonry or timber structure behind it.