High-quality, durable, extremely precise dosage, and a bottle mount that may be used in a variety of ways. The dosage locking mechanism is positive. Protective fi tting for vaccination bottles or packs. Bottle Shroud (20mm diameter bottle neck) and three collars (20mm, 30mm, and 33mm diameter bottle necks) are included. Injects a range of medications. Viscous products can be dispensed. Permanent marks on a high-performance cylinder.