It would seem to be very standard practice in theatrical applications to use 1/4" grade 30 proof-coil chain for trim chains to connect flown hard scenery to battens. I imagine this is because it is readily available, not too expensive, and will accept a shackle. However, this chain is always labeled "not for overhead lifting." Is it because we tend to have about a 20x safety factor on the breaking strength of the chain that we feel OK about it? Does anyone have something they prefer? Spansets or webbing are good, but not adjustable and would burn in a fire. Does anyone use the (very expensive) grade 80 deck chains specially made to accept a shackle that are available from Fehr?