Shi Shi Tong is the manufacturer of custom knurled head thumb screw . The most commonly used materials for thumb screws are aluminum, brass, steel and stainless steel. Typically used to secure objects in electronic and computing applications, these knurled head screws are designed to be hand-screwed into pre-drilled and threaded holes. Place the knurled pattern on the screw head and tighten or loosen by hand. Manual screw for adjusting screws or screws, this design is easy to remove in the future. Screws from the Shi Shi Tong Screw Factory are available in a variety of head styles to ensure you have the right hardware or knurled head thumb screw . From the building deck to other outdoor operations, high quality stainless steel screws are essential for proper work. Shi Shi Tong offers a variety of special screws. Whether indoor or outdoor. Including machine screws, self-tapping screws, captive screws, long screws, titanium screws, sems screws, bras...