We have the big fish holders at home and have made sea bream in it. Really great. The holder holds the fish safe position. The turn is a breeze with gloves. The fish is held in such a stretchable cushion. We have put the images online.
The holder fits for the Weber gas grills from the Q200er series. For charcoal grills from '57. Anyone who owns a small grill, chooses the small holders.
After use, the holder (stainless steel) came just in the dishwasher, ready.