Dryzone System Fixing Plugs are used to hold the plasterboard in position. They are not used to hold the weight of the board - just to allow a smooth join between boards. Use a 5.5mm drill bit to drill 4 - 6 holes at board corners and middle no closer than 25mm to edges. Tap in Positioning Plugs with a hammer, ensuring the final surface is even. A quick and easy way to seal holes in bricks or mortar after using Dryzone® DPC cream or Dryrod® damp proofing rod installation. Designed with fins to fill injection holes of 10-12mm, these damp proof plugs offer essential protection against the elements. Easily fills DPC injection holes of 10-12mm diameter. 25mm plug length with fins for a firm and secure fit. Suitable for sealing holes drilled in bricks or mortar. Buff beige finish to match similar mortar or brickwork. Quick and easy alternative to using sand or cement.