Heavy Duty 1/32-5/8 Inch R8 Precision Integrated Keyless Drill Chuck (B18)

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.