MBL = Minimum Breaking Load The standard finish of our sockets is blue. Hot dipped galvanized is also available. Socket range OWS 0.25 until OWS 0.5 is delivered with galvanized finish, other finishes are available upon request. All sockets are provided with an EN 10204-2.1 declaration of conformity, EN 10204-3.1 material certificate and can be provided with a 2006/42/EC declaration where applicable. Meets performance requirements of API 2C.