Earl Diamond Super Heavy Duty APU16 1\/32-5\/8 Inch R8 Shank Precision Integrated Keyless Drill Chuck

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: Integral Shank is more compact than a combined drill chuck ,self-tightening key-less feature automatically increasing gripping force, high reliability, and stability.