SMALLRIG 7" Articulated Magic Arm with 1/4 Thread & 15mm Rod Clamp Railblock for DSLR Rig Support System for LCD Field Monitors and On-Camera LED Video Lights - 1013 Triple jointed magic arm with 15mm rail clamp Fit industry standard 15mm Rods 60mm Rail distance system Provide great versatility for the positioning of accessories such as monitors, viewfinders, digital recorders and camera lights Made of durable anodizing black aluminum alloy Maximum load capacity: 3kg; Best weight load 1.5-2 kg.