The term kazuuchimono (kanji: 数打物) means "mass-produced things" in English. It is written かずうちもの in hiragana. It may also be rendered in English as kazuuchi-mono. It's pronounced roughly like "kah-zoo-oo-chee-moh-noh".
Also known as simply kazuuchi. Mono, 物, means thing(s), object(s), product(s). Not only swords but also spears can be 数打, that is, mass-produced. 数 means number or amount. 打 is normally used as the verb 打つ (utsu, “to hit”). So the suggestion is that the objects (be they swords or whatever) are being forged and hammered out one after the other with a regard only for quantity.