Based on the time-proven SR series models, the SR-6C-HT Stereotaxic Instruments are intended for exclusive use with common marmosets and feature many useful functions to hold the animal securely in place for stereotaxic procedures. The auxiliary ear bar particularly designed for the ears of common marmosets allows for the clamping in one hand, and also allows the fixation to the ear holes confirming the feel with the finger tips. Eyepits are held with the holders with cancellous surface which was also designed to minimize the damage to marmosets. By holding ear holes, eyepits and upper jaw, stereotaxic fixation is ensured. An 18.7mm AP frame bar is provided, to which many different types of accessories can be attached besides the micromanipulator: SMM Series (SMM-100 / SMM-200) or SM-15R/L. The SR-5C-HT Stereotaxic Instruments have one AP frame bar, while the SR-6C-HT Stereotaxic Instruments have two.