This model offers maximal adjustment for positioning the head. The adaptor can rotate the head to multi angle without blocking the anesthetic gas delivery.68057 Mouse Gas Anesthesia Head HolderVertical adjustable range: 30mm (+10mm~-20mm), with 100μm accuracy.Vertical rotatable range: 70° (-35°~ +35°), with 5° accuracy. Horizontal rotatable range: 70° (-35°~ +35°), with 5° accuracy.Horizontal adjustable range: 43.5mm.Diameter of inlet/outlet of the mask: 2mm.