Our Three-Prong Tee Nuts hold securely and avoid the wood-splitting produced by 4-prongs! Available with barrel lengths ranging fromåÊ5‰�ã16" to å_". Also available with å_-20 ,åÊ5‰�ã16-18, and METRIC M8 Threads. Zinc-plated. A 6-Prong Tee Nut is also available with aåÊ7‰�ã16" long barrel with 10-24 Threads. Additional US Standard or Metric Threadings available on special order.