PB-05Fix spacer battens into masonry, dot-and-dab or lath and plasterInto solid brick or block, drill with a 6mm masonry bit to 45mm depth, blow out the dust, insert a red wall plug and drive in a 6x50mm screw. Into dot-and-dab plasterboard, drill through the plasterboard and dab gap into the masonry behind — expect around 25-50mm of air gap — and use a screw and plug long enough to still get 30mm of grip into the brick, typically 60-75mm overall. Into lath and plaster, don't rely on the laths themselves, as they're thin and crack easily; use the stud detector to find a solid timber joist or stud behind and screw into that, or fit a plasterboard-rated toggle for light loads only if there's no timber to hit.