This is only a necklace, but he does what he is asked: tighten and hold the lens without damaging it. Good quality all metal with felt inside and screws / nuts in metal, it can balance the weight distribution and avoid that the objective pulls too far forward on the ring of the case. Try to drill with tripod, the stability of the whole is better and more enjoyable. The collar integrates perfectly with the 100 macro. I honestly do not see what a 3times more expensive necklace would bring more to my use.