Plasplugs Originals General-Purpose Fixings are regular-duty, suitable for concrete, brick, breeze block and stone. The plugs feature multi-action grips, expanding barrels, barbed jaws and anti-rotate ribs. Typical applications shelving, curtain poles, lighting, hooks and brackets, pictures and mirrors. Colour Brown. Screw Type No.6-12 (3.5-5.5mm). Drill Bit 6mm. These Plasplugs SGP550 Originals General-Purpose Fixings are supplied in a clip pack of 50 plugs.