Nickel plated beer nut that is standard in the beer industry. To get technical, the threads are 7/8"-14 (5/8" BSP). But you don't really need to know that. All you need to know is they will screw on to any:

• Faucet shank or coupling shank
• Beer coupler (Sankey D, etc.)
• Any of our jockey box inputs
• Any of our jumper box inputs

They also are used in making keg jumpers or shank jumpers and assembled onto tubing with:

• Tailpiece
• Hex nut
• Beer washer
• Hose clamp