Techniks capto compatible ER chucks handle a wide range of machining tasks without having to buy dedicated tool holders. Simply choose the right size collet for the job, set tool depth, and tighten the collet nut and pull stud to the proper torque using a torque wrench and tightening fixture. Use "PowerCOAT" nuts to increase the holding power and safety of your tool holders. High holding power extends cutting tool life and improves surface finish.