Sure Shot automatically measures liquors, cordials, coffee syrups, cooking oils and more. It fits easily onto most bottle tops and means no over-pouring or under-pouring. A must have to make consistent cocktails with ease. Valve alongside the main cylinder prevents after-drip and eliminates waste. The primer ring channels liquors around the inner ball bearing for a more accurate pour, and three ball bearings provide a smoother pour. Bottom design ensures that ball bearings will never fall into a bottle. No polycarbonates are used in making the Sure Shot so it doesn't break down from long exposure to alcohol. A patented locking system makes it less susceptible to breaking.