The shape makes it easy to use of coral. ZOOX Grow Flag Plug A Type Target Coral Features: This plug is perfect for cutting and developing corals. The surface has a mesh shape that makes it easy to use of coral. Perfect for coral flag base circle type. Contents: 12 pieces. Size (approx.) 1 plug: Diameter 1.0 x Height 1.0 inches (25 x 26 mm). Thickness: 0.2 inches (6 mm). Plug part: Diameter 0.4 x Height 0.8 inches (9 x 20 mm). Country of Origin: China.