The small rod clamp is tiny but useful, it can extend lots of application.The clamp is for 15mm rod support rail system, follow focus support.Fits standard 15mm rods , strong,simple,great priceIt is used to connect magic arm, LED light, flash, LCD monitor.It is made of aluminum, anodized black and sand-blast finishing. Strong and durable.Simple and useful.Wingnut Color - Black Net weight ONLY 44g.