★ EXTREME HARDNESS: Crafted from top-tier alloy spring steel and tempered to achieve HRC 44-48, with precise grinding of all key surfaces.
★TRUE DOUBLE ANGLE for Better Accuracy, the runout is 0.0003" for size 1/8" and larger, and 0.00059" for undersize 1/8".
★ECCENTRIC DESIGN: The inside of the ER32 collet nut is intentionally designed like off-centering to help mount the ER32 collet much easier.
This collet size is true imperial fractional size, not a metric converting size and the surface on this collet has been specially treated to increase its tool life.