A hexagon set screw is a fulley threaded fastener with a hexagonal head shape. This type of bolt is designed to be installed using a spanner. Hexagon set screws are favoured for their robust shape, which makes them suitable for more heavy-duty fastening applications. https://bmgworld.net/bmg/en/ZAR/All-Categories/Fasteners/Bolts/Hexagon/Set-Screws/M10X1-2540HTS10-9ZP/p/M10X1.2540HTS10.9ZP