Rawlplug UNO Plugs are truly universal plugs which fix into any wall, ceiling or floor. Suitable for use in concrete, brickwork, stone, blockwork, and plasterboard. They feature a unique design with expansion throughout the length of the plug, expanding at the top for instant grip. Anti-rotation features prevent spinning in the hole. Screw head size varies by color: Yellow (3-4.5mm), Red (3.5-5mm), Brown (4-6mm), Blue (4.5-6mm), Grey (5-8mm). Typical applications include shelving and cabinets, suspended ceilings, switch boxes, trunking and cable trays, water heaters, and radiators. This pack contains 272 plugs in various colors (Red: 6 x 28mm, Brown: 7 x 30mm, Blue: 8 x 32mm) and includes a drill bit.