2pcs Rail Rod Block Clamp for 15mm Rods Support Dslr Rig System
Rail Block Rod Clamp 1/4"-20 thread and 3/8"-16 thread for 15mm Rods SupportIt is used to connect  follow focus,magic arm, LED light, flash, LCD monitor...4 Types of Thread: 1/4", 3/8", M4 & M5 thread.1/4" thread: thread diameter is international standard 1/4";3/8" thread: thread diameter is international standard 3/8";M4 thread: thread diameter is 4mm;M5 thread: thread diameter is 5mmPackage Included:2 x  RailBlock