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Albrecht Micro-Chuck Extensions provide access to hard-to-reach areas that cannot be machined with standard tool holders.These precision extensions use highly accurate coated collets that are similar in design and performance to the Überchuck Milling Chuck collets.Model 74600 incorporates our model 15 keyless drill chuck with a capacity of 0.2–1.5 mm (0.008″–0.063″).Accuracy of the Albrecht Micro-Chuck is guaranteed to 0.0003″ TIR at 2.5 x diameter for the collet models, and 0.0012″ TIR for the drill chuck model.Although Albrecht Micro-Chuck Extensions perform best when used in conjunction with Albrecht Überchuck Milling Chucks, they can also be used with other types of tool holders such as ER collet chucks.Note that the models 74602 and 74604 have 9/16″ diameter shanks which enables them to be used with both the model 14 and 20 Überchucks.