Easy Life Locknut Spanner New 20mm/25mm electricians Locknut Spanner, designed by an electrician for an electrician. The spanner has been designed to be used with any 3/8 socket set drives. It has been designed for easy access to locknuts in confined spaces and also to give a firm grip to 20mm/25mm locknuts. The tool also was designed for cables which are already coming out of the locknut.