Features: Made from stainless steel material, which has excellent anti-rust, oxidation resistance, and corrosion resistance property, not easy to break. All these grub screws with clean cut and fine thread provide stability for mechanical component fix and prevent mechanical component from loosening. Hexagon Socket Head Screws are used to fix mechanical component to maintain position and prevent mechanical component from loosening, provide stability and reduce the risk of equipment accidents. All screws are put in a sturdy clear box which come with clear size and quantities chart. Suitable for doorknob installation, faucet repairs, light fixtures, knobs, plumbers and other small repairs around the shop, garage or home. Specifications: Material: Stainless Steel Size: As Shown in the Picture Package Includes: 20pcs M5x10 20pcs M6x6 20pcs M6x10 20pcs M8x8 20pcs M8x12 20pcs M4x4 20pcs M4x6 20pcs M4x8 20pcs M5x5 20pcs M5x8 20pcs M 2.5x4 20pcs M 2.5x5 20pcs M3x3 20pcs M3x4 20pcs M3x10 note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.