This adaptor is to be used for mice and neonatal rats on the stereotaxic instruments.

The ear bars of this adaptor are made of resin and the tips are specially treated, which ensures that the head is held firmly without damage to the skull. There are scales on the incisor and the earbars. The height can be adjusted flexibly, which is good for manipulation from different angles. Considering that there is no ear canal in neonatal rats, this adaptor employs a cheekbone locker in stead of the ear bars. This design provides a noninvasive and stable way to hold the neonatal rats.