1/2” (12.7 mm) Outer Diameter Flexible Plastic Hole Plugs, Round Black Metal Tub
They are also designed to hold up against impact abuse, and harsh weather conditions. 1/2″ deep / tall to provide a secure fit. Plug Size 0.5″ – 5″ (12mm to 127mm) 0.5″ – 5″ (12mm to 127mm) 0.5″- 3″ (12mm to 80 mm) 0.5″- 3″ (12mm to 80 mm) 0.75″/1.5″-2″/4″ (19/38 – 50/100 mm).