These stainless steel–diamond inserts and stainless steel–sapphire inserts (sapphire nozzles, diamond nozzles) are clearly superior to competing products and offer higher performance than inserts made from materials such as ceramic or steel. This is thanks to a very compact and aggressive water jet. The integrated jet stabilizer ensures a concentrated and powerful water jet density. The service life of a sapphire insert is much longer than that of hardened steel nozzles or other drilled inserts. Sapphire inserts are used primarily in the clean-water jetting industry. Sapphire inserts are less suitable for dirty water (recycled water).