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Bolts are not included and must be purchased separately. This product is designed to seal the ends of pipelines or connections. Available sizes range from DN15 to DN200, with diameters increasing from 80mm to 320mm. Thickness varies between 12mm and 22mm. The number of bolt holes and their sizes also differ according to the flange diameter. For example, DN15 flanges have 4 holes for M10X45 bolts, while DN200 flanges have 8 holes for M16X70 bolts. Each flange is coated in black primer paint, which may chip or flake during transportation; however, this will not compromise the flange's quality. Once installed, flanges are typically painted in red oxide to prevent rust, especially when connected to pipework with a pump or valve. Choose this engineering flange for reliable sealing performance and durability.. JTM PN6 Screwed Flange Black - 6 inch Steel FL-070-D