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4pcs HSK63A-ER20 Longer 4" Collet Chucks Balanced G2.5/24000rpm #HSK63A-ER20-4"
Gage Length: 4"/100mm
Balanced to G2.5/24000 RPM at G2.5.
T.I.R. 0.0001" measured from taper to collet pocket.
Taper ground to AT3 accuracy for maximum contact with spindle.
Certified for accuracy and balance.