かすがいじゃなかったです
鎹じゃなかったです
kasugaijanakattadesu

Noun
Desu Copula

The polite, past negative form of かすがい

1. Wasn't (a clamp/vise); Wasn't (a metal fitting)

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana