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Features :
Material: 40CR, hardness HRC60.
Bit holding capacity: Clamping Capacity 1/32~5/8"; Shank R8.
R8 shank: Suitable for drill presses or lathes spindle accepts R8 shank.
Maximum T. I. R. does not exceed . 002"; Keyless, self tightening design.
Design: Self-tightening key-less feature automatically increasing gripping force, high reliability, and stability.