Flange Gasket, Full Face, 1 in Pipe Size, 4 7/8 in Outside Dia., Bolt Holes 4, 1 5/16 in Inside Dia., Metal Detectable No, Material of Construction Aramid Fiber with Neoprene Binder, 1/8 in Thickness, -100 Degrees to 400 Degrees Temp. Range (F), Color Dark Gray, Standards ASME B16.21