Allen + Cup point: Cup points have a cup-shaped point to indent into the contact material and is a commonly used style for permanent or semi-permanent installations on soft or hard surfaces. All set screws are professionally milled or ground to reduce the chance of slippage and increase load capacity, improve torque resistance and transmission, and improve good resonance. When installed correctly, set screws can successfully with withstand heavy torque applications. SAE + Metric: The set screw kit contains conventional 12 SAE set sizes and 12 metric set sizes. Metric : M3 M4 M5 M6 M8. SAE standard: 1/8, 5/32, 3/16, 1/4, 5/16. Also comes with 10 hex wrenches for metric and SAE. Stainless steel 304: A highly corrosion resistant grade of stainless steel. Set screws are made of stainless steel and are case hardened to increase their life and product hardness.Ideal in salt water and high pressure environments. Wide Application: Set screws are widely used in all manner of engineering, product design and repair applications, often to keep a potentially moving part locked in place. This could involve fixing a component against a baseplate, for example, in various sorts of panel arrays and mechanical assemblies. Common specific examples of set screw use might include affixing spindle cams and handles or securing gears and pulleys to a shaft. Service Guarantee: We have a 1-year quality problems package replacement, lifetime warranty. If you have any question or suggestion, Please feel free to contact us anytime. We will do our best to provide you a pleasure shopping experience. JROUTH 1000pcs Metric + Standard SAE Allen Head Socket Hex Grub Screw Set 304 Stainless Steel Internal Hex Drive Cup-Point Screws Assortment Kit (M3-M8, 1/8"-40 to 5/16"-18)