Romak Stainless Steel Hex Head Screw Set is used to fasten a metal to another metal through a pre threaded hole. They can also be used as a small diameter bolt to secure an object with a nut. Ideal for a wide range of metal projects, perfect for those around the house and garage jobs. A wrench or hex screw driver is required to fasten these screws. Screws with hex head sits on the surface with a thick head, providing ample bearing surface for tightening with a wrench or hex screw driver. This reduces the chance of stripping the screw head. Specification: head type: hex head, thread diameter: M6, overall length: 50 mm, finish / colour: stainless steel, system of units: metric. Comes in a pack of 6 pieces.