Richelieu 296101RDP 5/16-18 NC Fractional Plug Tap:

• Titanium nitride coated for superior performance
• Manufactured to exacting specification from long-lasting tool steel
• A good range of sizes and thread types to meet the needs of most tradesmen, mechanics, and do-it-yourselfers

* Tap sizing consists of two numbers; the first number refers to the diameter of the hole being threaded, the second number states the number of threads per inch.