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Bolts are not included and must be purchased separately. These caps seal the ends of a pipeline or connection. They come in various sizes: DN15 - 95mm diameter, 14mm thick; DN20 - 105mm diameter, 16mm thick; DN25 - 115mm diameter, 16mm thick; DN32 - 140mm diameter, 16mm thick; DN40 - 150mm diameter, 16mm thick; DN50 - 165mm diameter, 18mm thick; DN65 - 185mm diameter, 18mm thick; DN80 - 200mm diameter, 20mm thick; DN100 - 220mm diameter, 20mm thick; DN125 - 250mm diameter, 22mm thick; DN150 - 285mm diameter, 22mm thick; DN200 - 340mm diameter, 24mm thick. All sizes fit steel pipe nominal bore sizes per BS-EN1092-1:2007. Nominal bore is the inside diameter of a pipe. Unsure of the size? Call our sales team at 01325 488588.. JTM PN16 DN100 Blank Flange - 4 inch Black Steel FL-028-B