Primacy&reg; / Rotated Head / M5 Thread Knob Screw Clamp for 15mm Rods DSLR Rail System Rig Follow Focus Riser Shoulder Support Camera Base Plate (1 / Blue) This standard M5 Screw is a replace part for camera plate, rig, riser, support, camera cage, follow focus, handle, camera dolly, rail system etc use. The special part of this screw is that when the screw was rotated to some degree, it will got stuck in some photographic accessories. When this happens, users only need to pull the screw head out and adjust it into a proper position then go on rotating till the screw up to ultra fasten status. The screw is made of aluminum and other durable material. Fits standard M5 thread holes accessories. Standard M5 type.