LiquidFix Door, Lock, & Hinge is an all-in-one product that was specifically formulated to clean, lubricate, and protect metal to metal friction points such as door hinges, locks, deadbolts, sliding glass door tracks, and more. The product was designed to penetrate quickly and easily into the working elements of a door hinge to instantly stop squeaking and squealing and prevent future rust and corrosion. With both a 4 oz. Bottle with a standard dropper top, and a 0.5 oz. Needle Oiler, you'll have any and all repairs covered. The 4 oz. Bottle is great for use on larger surfaces such as sliding glass door tracks, garage door rollers & tracks, large gate hinges, car doors, and many other large scale household applications. The 0.5 oz. Needle Oiler is designed for precision applications where one or two drops is all you need. This is great for mitigating messes in the house and reducing the amount of waste. Ideal applications for the 0.5 oz. Needle Oiler include door hinges & door locks, combination or key locks, handheld tools, or any other small, precise, household applications. LiquidFix Door, Lock, & Hinge lasts longer and stays in place better and will keep your doors opening and closing smoother, more quietly and better without the downsides of messy dry lubricants thin spray-on products for weeks and months to come.