These hole plugs from B&Q are for infilling unused furniture hinge holes.
Details of Israel Duplex Three-hole Wall Power Socket
Wardrobe rails & fittings
Black Hole plug (Dia)19mm, Pack of 10
Hole Plugs Black Nylon Snap In Cable Hose Bushing Grommet Protector Round Snap Panel Locking Hole - Buy China Wholesale Cable Hole Plug $0.017
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Hillman 2-Pack 0.875-in Black Plastic Hole Plug in the Hole Plugs department at
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Heyiarbeit 30pcs Hole Plugs 30mm/1.18 Nylon Plastic Round Snap in Type Locking Hole Tube Furniture Fencing Post Pipe Insert End Caps Black Tone - Yahoo Shopping