The MK2 -B16 self-tightening keyless lathe drill chuck is made of alloy with fine workmanship, easy to grip.<br> Ergonomic Design - Unique alignment allows torque to be applied around the handle for greater clamping force.<br> EXCELLENT PERFORMANCETightening range: 1-16mmRecording: MT2Self-tightening keyless lathe drill chucks feature unique thrust bearings that help apply greater clamping force through the handle for secure operation.<br> KEYLESS DESIGN The self-tightening keyless lathe drill chuck is a keyless design that can be tightened and loosened by hand for faster and easier tightening and loosening.<br> AUTOMATIC LOCKDuring operation machining, the clamping force of the drill chuck increases proportionally to the cutting force.<br> WIDELY USEDSuitable for drilling machines, milling machines, lathes, drill presses and electric hand tools, etc.