GRACE USA 12 Pc Roll Spring Punch Set is manufactured from the highest quality High Carbon molybdenum Tool Steel and heat treated to ensure long life of the punch. Each punch has a reverse taper from tip of punch to help prevent punch from sticking in the work piece. Punches are manufactured from hex stock vs. round which helps stabilize punch from rolling away from user. Sizes are 1/16", 5/64", 3/32", 1/8" 5/32", 3/16", 7/32",1/4", 5/16", 3/8", 7/16", 1/2". 100% Made in the USA. A TRADITION OF EXCELLENCE SINCE 1941: Since being founded in 1941, every tool that has been produced by Grace USA has undergone a rigorous inspection process which helps ensure genuine QUALITY and PRECISION in every tool that you can TRUST Made from the highest quality High Carbon molybdenum Tool Steel and properly heat treated to ensure long life of the punch Each punch is hardened the entire length with tempered striking end and are centerless ground for complete accuracy Incorporated Reverse taper from tip of punch to help prevent punch from sticking in the work piece Three identifying machine marks to help distinguish between our regular pin punches