GSB50 50A MILITARY SPEC FUSE
Manufactured by G.E.C. Alsthom as their type GSB50, these are 50A ceramic bolt down fuse links.
Also made to military specifications under the NSN part number 5920-99-951-2525
Overall length is 76mm with hole centers at 60mm. The diameter across the end caps is 17mm.
Priced and supplied each x1.