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It's a WEDGE-HOOK type 3-jaw with the extra-large through-hole.
o Matching surfaces of all parts hardened
- ground and lubricated directly
Construction of high rigidity and high clamping accuracy.
J value is the hole diameter of blank draw nut
- K is the maximum thread specification
- and it could be customize.
LARGE THROUGH HOLE POWER CHUCK AG-3H-21B-A15