GREAT QUALITY: These set screws are made from 12.9 grade carbon steel material, 304 stainless steel material provides strength and has good corrosion resistance in many environments, durability and long life life WIDE APPLICATION: suitable for door handles, machinery industry and other small repairs around shop, garage or home furniture fixing etc. FEATURES: this are hexagon socket head cap screws that you can easily use with hex keys, easy to use SIZE: M3 (3mm ~ 14mm), can meet your different needs in your need QUANTITY: package included about 220 screws in total Description: An adjustment screw is a type of screw typically used to secure an object in or against another object without using a nut . The most common examples are attaching a pulley or gear to a shaft. The set screws are fully threaded and do not have a head that protrudes beyond the main diameter of the thread. These set screws are driven with an internal hex wrench. Specifications: Surface finish: Oxidation < br /> The