The RAM-PF-585-12 is a 12" flexible metal pipe, with composite cover, that has a 1/4" NPSM male thread at both ends of the pipe. 

NPT / NPSM Thread Statement: 
There will be some binding of the threads due to the nature of the NPT / NPSM threads. The mount will be secure when tightened as fully as possible.

Material
Metal with Composite Cover

Note
Part number reflects product packaged in clear clam shell for store shelf display.