This post plug is made of brass and fits the large detachable brace post assembly   

Nickel Silver Threaded Post for Large Detachable Brace Post Assembly without the Radius  

Includes: Nickel Silver 5/16 x 32 Knurled Nut, Nickel Silver Nut Stop, and the Nickel Silver 5/16 x 32 Threaded Radius Post OAL is .650"  

Nickel Silver 5/16 x 32 Knurled Nut is part of the small detachable brace post assembly

Nickel Silver Nut Stop is part of the small detachable brace post assembly