The practical MASTER-BOX with fischer expansion plugs SX 6, SX 8 and screws.Top FeaturesSimple to assemble: The edge of the plug prevents it from falling deeper into the drill hole.No expansion pressure on the plug neck. This means that tiles or plaster are not damaged.With the appropriate screw for maximum hold.Optimum force transmission due to four-way expansion. This allows for high holding values in solid and hollow building materials.