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