Strong, reliable fixing: the plug expands inside the hole as the screw is driven in, gripping concrete, solid brick and ceramic blocks Anti-spin design: anti-rotation fins and ribs stop the plug spinning in the hole, so it expands evenly as the screw goes home Flush collar: seats the plug flush with the surface for a neat finish Simple installation speeds up the job M10 x 50mm size: 10mm diameter and 50mm long, for a 10mm drill hole (drill bit size = plug diameter); polypropylene (PP) plug body Easy to choose: this listing is M10 x 50mm, pack of 25; the range covers 5 sizes, M6 to M14, in packs of 10 to 500; use with a metric, wood or coach screw (not included) For plumbing, building and home jobs: pipes and conduit in plumbing and heating installations, railings and other fittings in construction work, machines and equipment in workshops and industry, and shelves, brackets, mirrors and other wall-mounted fixtures around the home and garage