This Vermont Gage 101200500 Pin Gage Set is a quality gauge block set that comes with 250 pieces of 0.2510 to 0.5000" pin gages in minus class ZZ. It is ideal for measuring hole sizes within +.0000/-.0002 in tolerance range and offers excellent durability thanks to its tool steel construction. This pin gage set can measure hole sizes within the plus or minus.0002" tolerances, making it suitable for use in inspection work involving all types of precision parts, tools and instruments. The Class ZZ pin gages are made from high-quality tool steel material for added durability and extended life span. These cylindrical shaped pin gages come with a length of 2 inches each for easy handling when measuring different components on machines or equipment during assembly processes. If you are looking for a quality product that can meet your inspection needs, then this Vemont Gage Pin Gauge Set is definitely worth checking out.