Rawlplug UNO Plugs are truly universal plugs which fix into any wall, ceiling or floor. Suitable for use in: concrete, brickwork, stone, blockwork, plasterboard. They have a unique design with expansion throughout the length of the plug. They expand at the top giving instant grip. Anti-rotation features prevent spinning in the hole. Screw Head Size: Yellow: 3-4.5mm Red: 3.5-5mm Brown: 4-6mm Blue: 4.5-6mm Grey: 5-8mm Typical Applications: - Shelving and cabinets - Suspended ceilings - Switch boxes - Trunking and cable trays - Boilers - Water heaters and radiators These Rawlplug UNO Plugs have the following specification: Colours: Red (6 x 28mm), Brown (7 x 30mm), Blue ( 8 x 32mm) Pack Size: 272 Supplied with a drill bit.