5/16" x 18, National Course, Self Aligning 1" Hex Die, Carbon Steel, Performance Threading System Threads Straight Every Turn, More Steel At Critical Points For Extra Strength, Ideal For Routine Maintenance, Repair Work & For Rethreading, Use With Performance Threading System Die Stock For Best Performance, Die Can Also Be Used With A Wrench Or Socket When Space Is Limited, Designed For Hand Threading Work In A Variety Of Materials.
