Classification of rivets: forged-and-tempered rivets fall under the residuary tariff item rather than roughly shaped forging. Forged rivets that undergo a subsequent tempering process, which materially alters their quality and gives them a finished shape, do not qualify as 'pieces roughly shaped by rolling or forging' under Tariff Item 25(8) or under Item 25(11) and are classifiable under the residuary Item 68 of the Central Excise Tariff.