NAAMS Standards NC Blocks in the ANI series are all manufactured with an I-shape and are blanks. The configurations come in 3 or 4 holes by 60mm, 80mm, 100mm, and 120mm. Widths are 20mm and 25mm and manufactured out of 4140 steel with a black oxide coating or stainless steel without black oxide.
NAAMS NC blocks are blank blocks that come in a variety of shapes with different hole configurations.They are manufactured out of steel SAE 4140 with a black oxide coating or stainless steel depending on the preferred NAAMS code.