Hey DIYers and mechanics! This ZDingTech set screw kit has exactly what you need for those tricky assembly projects. You get 30 pieces of 5/16-24 x 1/2 inch set screws made from durable 304 stainless steel that won't rust or corrode. These headless grub screws feature a hex socket design and come with a handy 5/32 inch Allen wrench for easy installation. The cup point tip digs deep into surfaces for solid holding power - perfect for securing pulleys, gears, door handles, window cranks, and all sorts of machinery components. Since they're headless, they sit flush with or below the surface for a clean look. The stainless steel construction means they handle high temperatures, freezing weather, and humidity like champs. No burrs or rough edges either - these are quality machined pieces ready to work right out of the package. Whether you're fixing furniture, working on automotive projects, or tackling home repairs, these set screws have you covered. The 1/2 inch length and 5/16-24 thread size are super common for various applications. Keep a set in your toolbox for those 'oh yeah, I need one of those' moments. Seriously, having the right size fasteners on hand saves so many trips to the hardware store! The included Allen wrench means you're ready to start working immediately. Quality fasteners at a great price - what's not to love?