To clamp the handle of microdrill, and then fix it to the operating arm of the stereotaxic device through a V-shaped connector. The drilling depth can be controlled by lifting and lowering the operating arm, which makes the operation convenient, accurate, and avoiding damage to animal brain tissue or excessive drilling depth.

The clamping sizes include 14mm, 15mm, 16mm, and 18.5mm, and also the the customized sizes are optional.

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