The BLOC 15 Arri Rosette Adapter for 15mm LWS and Studio-Spaced Rods from SHAPE provides a left hand and a right hand Arri rosette for the addition of hand grips and other accessories to a 15mm rod system. The adapter features both 60mm center-to-center "LWS" (light weight support) and 100mm center-to-center "Studio" spacings for compatibility with virtually any 15mm rod system (19mm rods are not supported).
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The quality is solid, but there are a couple design flaws that sort of are a little bit annoying. It's basically reversible...so you could orient it one way one time and upside down the next. The problem with this is motor memory then makes it hard for you to remember if you are loosening it or tightening it. So when you think you're tightening it, you may in fact be loosening it and it all falls apart on you. Along with that, when you're putting it on the rods, there is no retaining pins on it or something so that it won't spin. Once you have it tightened enough, the rods keeps it sort of in place, but when you take it off rods, it's basically like a fidget spinner. Fun to play with, but very annoying when trying to put it together when handling a camera while doing it. It's plenty solid, but these seemingly minor flaws make it less than ideal and would probably keep searching for something else. It's not bad enough I won't keep it.