If you're looking to create your own soft plastic fishing lures, this 4-ounce aluminum injector is the perfect tool. Built from solid aluminum, it comes with a standard five-eighths inch nozzle, making it compatible with most aluminum or engineered-stone bait making forms. Both the nozzle and the piston feature high-quality rubber O-rings for a tight seal and reduced leaks when working with hot plastisol. The plunger glides smoothly, giving you steady, even pressure for consistent results every time. Because you'll be working with heated material, the injector itself can get quite hot — so always wear protective gloves and handle it carefully. This injector is specifically designed for casting fishing lures with hot plastisol. Just draw the heated plastisol into the chamber, line up your bait cavity, and press gently but steadily to inject. One important note: the tip of the injector uses a press-fit design rather than a screw-on or pinned connection. Use only moderate, even pressure on the plunger to prevent spills. With its solid build, universal nozzle size, and easy operation, this 4-ounce aluminum injector is a reliable, high-quality tool for anyone making custom soft plastic baits at home.