High-Quality Material: The set screws and wrenches are made of stainless steel, which is rust-free, pollution-free and durable. Product function: The set screw passes through the threaded hole in the external object and is close to the internal object to prevent it from moving relative to the external object. It exerts a compressive or clamping force through a base protruding from the hole. Package includes: 40 x fixing screws + 2 x hex wrenches. High-Quality Material: The set screws and wrenches are made of stainless steel, which is rust-free, pollution-free and durable. Fixing screws: Coarse-threaded CUP POINT SS hexagon socket grub screws. The head is flat and smooth, the force is evenly distributed, and the fastening effect is good. Scope of application: Fully threaded headless screws with fluted hexagonal driver for mechanical applications. Product function: Apply compression or clamping force through the base protruding from the hole. Package includes: 40 x fixing screws + 2 x hex wrenches. ASIN B0CY5MFFQH Brand DGBRSM Color Silver Set Name DGBRSM 40-Piece Stainless Steel Allen Head Hex Socket Set Screws with Hex Wrench Head Type Socket Size Name 4-40 x 1/8¡° Metal Type Stainless Steel Unit Count 40 Count Part Number 51675-SSHHH-18-40 Thread Size 4 Thread Type Unc Drive System External Hex Finish Types Uncoated Manufacturer DGBRSM Thread Style Right Hand Fastener Size 4-40 x 1/8 Fastener Type Machine Screw Item Diameter 0.19 inches Material Type Stainless Steel Exterior Finish Stainless Steel Number Of Items 40 Thread Coverage Fully Threaded Number of Pieces 40 Outside Diameter 0.19 inches Screw Head Style Flat Screw Point Style Cupped Point Set Screw Thread Type UNC