Replacement supports for a cheap desk cupboard shelf. I copied the remaining pegs to make the new model. The grey ones pictured are the original ones. They had got lost because no one had put a screw into the peg to hold them in place. I found some screws to suit.

Both pegs are 5mm in diameter by about 7mm long. The edge of the top peg is 7.7mm (center 10.2mm) from the wall so it must an imperial measurement.