Material: 40CR, hardness HRC60 Heavy Duty Drill Chuck: Includes the 1/2 drill chuck, #2 Morse Taper Arbor and Jaw Tightening Key. Taper Shank: The drill chuck can be installed on the headstock or tailstock of a lathe that accepts #2MT accessories Earl Diamond Super Heavy Duty Drill Chuck 1/2" Capacity with R8 Shank Precision Integrated & K32 Key (R8-B16) Save 6% Lowest price in 30 days Add to cart 002; Keyless, self tightening design. 002; Keyless, self tightening design. Bit holding capacity: Clamping Capacity 1/32-1/2; Shank R8., R8 shank: Suitable for drill presses or lathes spindle accepts R8 shank., Maximum T., I., R., does not exceed . R8 Collet Set CBTONE 1/32"- 5/8" Heavy Duty Drill Chuck With Chuck Key And MT2 Shank... R8 Collet Holder Peanut Butter Wolf / Egyptian Lover / Knxwledge / Earl... Suitable for drill presses or lathes spindle accepts R8 shank. Design: Self-tightening key-less feature automatically increasing gripping force, high reliability, and stability. Drill chuck designed for drilling applications on portable bench, floor type drill presses, mills, lathes & more.