construction: Made of 304 stainless steel, this is a plunger assembly formed by spring compression, bead and shell through an interference fit. It offers strong hardness and good corrosion resistance. The thread is deep and sharp, the force is uniform, firm and nonslip, and the surface is smooth. Specification: Hex socket screw size M5 x 16 mm; Thread length 16 mm; Thread diameter 5 mm. Hex socket design with two head options: hex socket screw (singlehead) or flat head (singleside head). Easy to drive with an Allen wrench, simple to install and use. Can be well hidden without affecting the aesthetics of the project. Features: Hexagon head ball screw ball head screw functions as a fixed screw ball roller with a spring plunger. The internal spring distributes load evenly even if the load is unbalanced, making it ideal for tight spaces and easy to install. Can also be used as a general spring plunger with a ball for fixing and positioning the workpiece, and the smooth rotation of the ball reduces friction between the ball and the mating surface. Set screw ball transfer unit with spring plunger function for upward applications. Use: Stainless steel spring ball head setting screw is suitable for and workshop, garage or other small repairs of water pipes, door handles, taps, knobs, etc. It is an ideal choice for indoor and outdoor fixed parts, industrial and construction fasteners and positioning. Use scenarios: In manufacturing fixtures and jigs to achieve repeatable, precise positioning of components in assembly lines or CNC setups. For home or maintenance, repairing and securing water pipes, door handles, taps, and knobs in both indoor and outdoor environments. In industrial or construction projects to fix and position parts where corrosion resistance and unobtrusive mounting are important, such as fixed components and fasteners in equipment and cabinetry.