Platinum 'Mesh-Fix' Plaster Plugs can be used internally and externally to secure our range of Damp Proof Membranes, primarily used in above ground installations. Use an 8mm SDS Drill Bit is normally used to drill through membrane and substrate prior to hammering home fixing plug. However a 7mm Bit may be used in 'poorer' substrates. Newton® 801-M Mastic Sealant should be injected into the drilled hole before fixing the plug into the membrane, it serves to stop any ‘bridge’ happening between the damp or stained surface and the new surface and is also used for sealing around protrusions. Plug Size: (W) 8mm x (L) 70mm.