"These plugs are identical to the Fischer S6 plugs and suit almost any non-specialist purpose.
The solid lower half splits in two, so that the outer teeth grip the hole firmly with a variety of screw sizes. The wings and fins stop them spinning as you start a screw. They work especially well with TurboGold or TurboUltra screws.
Top Tip: They come in 3 sizes, but the correct drill size is embossed on the side of each one."
"An excellent high quality plug which is good in a wide range of materials and is stronger and more robust that many. "Wings" help to locate item snugly and stop that annoying trait of cheap plug to spin round in the hole when you try to screw into them"