123 Blocks 23 Holes 1 2 3 Block Within .0002″ Tolerances 3-2-1 Blocks Set Used High hardness, not easy to deform, not easy to wear, rugged. Precision ground.
123 Blocks 23 Holes 1 2 3 Block Within .0002″ Tolerances 3-2-1 Blocks Set Used High hardness, not easy to deform, not easy to wear, rugged. Precision ground and case hardened on all six sides.
