Aspen Fasteners 13SO002-1428X58 Hex Drive Rounded Head Screw, Black-Oxide Alloy Steel, 1/4"-28 Thread Size, 5/8" Long (Pack of 100) Go to amazon.com Related posts Top 10 recommendation rounded bolt head for 2022 FeatureMaterial: alloy steelThread size: 1/4''-28Length: 5/8 inch Description8-32X3/4 Coarse thread socket head cap screw black. Made in United States. Manufactured by Aspen Fasteners.