Size - 1/2" BSP; Diameter: 65mm; Center Hole Diameter: 20mm with 3 holes for screws, the flange matches any interior decor including various designs Materials - Industrial Malleable The cast iron floor threaded flange is made of iron, carbon and silicon alloy composition with high strength, anti-rust treatment, plasticity and machinability. Thread - Pipe Thread (NPT). Applicable to most iron pipes are commonly used for piping. They are used to connect pipes on the floor or wall 1/2 inch black floor pipe connectors can be used to make shelves, pipe furniture, drying racks, shelving, retro lighting and any industrial craft decor The black malleable cast iron threaded floor flange is a great choice for all your needs. Ideal for industrial pipe furniture and DIY decoration projects Specification Color: Black Materials: Cast iron Connection method: screw< /p> Size: 1/2" Inner diameter: 1.8cm Type: Axial type Product use: flowers, lamps, shelves, hanging shelves, industrial supplies, etc.