Size - 1/2 inch BSP; Center hole diameter: 20mm with 3 holes for screws, the flange can match any home decoration including various designs. Materials - Industrial malleable iron floor thread flange is made of iron, carbon and silicon alloy composition with high strength, anti-rust treatment, plasticity and machinability. Wire - Pipe wire. National pipe taper thread (NPT). Applicable to most iron pipes are commonly used for plumbing installation. They are used to connect pipes on the floor or wall. Structure - Surface frosted, anti-rust treatment, thread alignment, casing forming. 1/ Black 2 inch floor pipe joints can be used to make shelving, pipe furniture, drying racks, shelves, retro lighting and any industrial craft decor