pangshi 1/4" 3/8" Thread Rod Clamp Rail Block for 15mm rod DSLR Rig Rail System Follow Focus The LED light set, LCD monitor can be attached on Shoulder Mount with this rod clamp holder. Made of metal, very solid and durable. This 15mm Rod Clamp with 3/8" 1/4" female thread is widely used on standard DSLR/DV Support Rig It is used to connect magic arm, LED light, flash, LCD monitor. It feattures 1/4" thread hole Simple design, easy to use.