British sourced, solid brass set screw (a set screw is a full thread bolt) with hexagonal head. See HERE for a summary data sheet detailing our range of nuts, bolts and washers and the descriptive code used to define them. Countersunk set screws are described by their overall length, hex and cheese head are measured by the length of thread. See below for dimensions. 12 sets of screw, nut & washer. Please email for larger orders or alternative sizes.