Two 4.5'' shell casings.

Artillery shell cases, fuzes, primers and tubes. – Stephen Taylor, WW2 Relic Hunter

Definitions and Information about Naval Guns - NavWeaps

RFI - Rod in middle of brass shell casing? - General Ammunition Discussion - International Ammunition Association Web Forum

Ammunition

Royal Navy 4.5 Inch Shell Case #2 - Sally Antiques

Shell (projectile) - Wikipedia

Is this bullet safe to keep around? - Quora

Definitions and Information about Naval Guns - NavWeaps

ammunition Auctions Prices

Cartridge (firearms) - Wikipedia

THE CARTRIDGE COLLECTOR

A large Russian 7 inch shell case, together with a pair of British 4.5inch shell casings: (3)

RFI - Rod in middle of brass shell casing? - General Ammunition Discussion - International Ammunition Association Web Forum

Three pieces of WWI trench art, to include two Howitzer 4.5 shell casings converted to ashtrays and