This simple and compact model is designed for a fixed head and specifically designed for easier use on the microscope stage. The method of clamping is based onOn the basis of three-point fixation (mouth, nose, ears), even small animals can ensure the stability of head fixation. By installing mouth/nose clamps and ear sticks on a single stick, this device can freely adjust the head angle 360 degrees. The development of gravity fixation has made the overall size of the frame particularly dense, making it more ideal for small animals to be fixed on the microscope stage. The shape and function are simple, but the shelf has a wide range of uses. SG-3N is suitable for large mice and small mice.