Allen Hex Drive Size: 5/32"(0.156"); Package Included: 25 PCS Thread Size: 1/4-20; Thread Type: 20 TPI Coarse Thread (UNC); Diameter of the head: 0.5 inch; Height of the head: 0.12 inch; Screw Length: 5/8 inch or 16mm ( measured from under the head) 304 Stainless Steel 18/8: Made of 304 Stainless Steel with black coating outside which is superior to regular stainless steel and any zinc plated fasteners, provides better strength and corrosion resistance in bad environments like high temperature, cold weather and high humidity areas without the need for time consuming and costly maintenance Design Feature & Applications: They are fasteners designed for assembling and securing wooden furniture pieces together; The flat head design allows the screw to sit flush with the furniture surface when installed, providing a clean and finished look; They are also black coated to resist corrosion and rust, ensuring long-lasting performance; They come in different thread sizes and lengths to accommodate different thicknesses of wood and assembly needs 1/4-20 x 5/8" Black Hex Socket Head Cap Screws, 304 Stainless Steel 18-8, Furniture Bolts, Connector Screws, Black Coated, Full Thread, 25 PCS