gary300
LifeTime Supporter
Lowes sells a 1/4-18 tap and 7/16 drill bit combo.
http://www.lowes.com/pd_579264-281-80260___?productId=50214679&pl=1&Ntt=irwin+tap
http://www.lowes.com/pd_579264-281-80260___?productId=50214679&pl=1&Ntt=irwin+tap