かすがいでわありませんでした
鎹ではありませんでした
kasugaidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of かすがい

1. Was not made of iron.; Was not forged.; Was not a metal implement.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana