sacrificial cauldron
鉶 refers to a specific type of ancient bronze vessel used for sacrificial offerings, essentially a ritual cauldron.
鉶 combines 金 (metal) with 刑, which likely provides the sound. The character denotes a metal ritual vessel.
The left side 金 (metal) and the right side 刑 (punishment) can be remembered as a metal cauldron used in solemn sacrificial rites, where offerings were made to avoid divine punishment.
For ケイ, imagine a sacred cauldron shaped like the letter K: K -> ケイ, and it holds offerings for a ritual.