Manufacturer Name: Ishigro Co., Ltd. Features: Generally used to stop fluid in plumbing pipes. [Uses] For stopping fluid in piping. Specifications: Nominal diameter (A): 1.0 inches (25 mm), Outer diameter (in): 4.9 inches (125 mm), Thickness (in.): 0.5 inches (14 mm), Number of bolt holes: 4 Bolt hole diameter: 0.7 inches (19 mm), Inner diameter: 0.0 inches (1 mm), Working pressure (K): 2.0 lbs (1.22 kg) [Material/Finish: Steel (SS40 kg). [Caution] Rust resistant varnish (1 kg).