British sourced, solid brass set screws (a set screw is a full thread bolt) with standard 82 degree angle countersink head and slotted screwdriver slot. 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 scew nut & washer. Please email for larger orders or alternative sizes.