SPI Hardness Testing File Set

Features:

• Practical, inexpensive method to quickly determine approx. hardness of heat treated work pieces and materials.
• Indispensable for every machinist and heat treater.
• Handy, color coded set of 6 testing files covers nominal hardness from 40 RC to 65 RC in increments of 5 RC.
• Special curved design for easy access in hard to reach places.