単純に見える吊り金具ですが、ほんのちょっとの工夫があります。H鋼にアイナットを強固に溶接してます。重量物を吊り上げるのでアイナットの内側も頑張って溶接しています。どこでも出来るような金物ですが比較してもらうと細部に見られる品質の良さがわかると思います。

Though the lifting brackets may seem simple, they have a bit of clever design. The eye nuts are securely welded onto the H-beam. Since they are used to lift heavy objects, we’ve also put extra effort into welding the inside of the eye nuts. While these fittings may seem like something anyone could make, a closer comparison will reveal the high quality in the finer details.