Penguin Brand thread in t-nuts for installing threads in pool table rails.  Used on newer style Valley and Dynamo rails which always pull out or unthread when removing rails.  We recommend using some epoxy on the threads when you install these. Also check out our standard t-nuts

• 1/4"- 20 internal thread.
• Installs with allen wrench.
• Comes in sets of 18- three for each rail in a set.