Experienced Divers Don't Do This Any More

Metal to metal stage rigging, brass alloy, and marine style snaps are no longer considered best practice among experienced divers. Even the best snaps can jam, but brass snaps are prone to jamming if not carefully maintained and they'll cut your thumb too. The marine snap (aka "suicide clip") is very effective as a line trap, and notoriously ineffective as a reliable attachment device. It's also proven to be a bad idea to clip yourself to bottles that have the clips permanently attached to the tank using metal-to-metal rings or clamps. Should a jam or entanglement occur, a diver might find it impossible to free themselves from the bottle. Straps and stainless steel marine-grade snaps that can be cut free in case of entanglement are now the accepted form of stage bottle rigging.