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Explanation: With all due respect, marcushm's traslation is OK, but his references have nothing to do with your context. The refs listed below do relate to your context.
From the second ref:
Lathe Tool Cartridge: A lathe tool cartridge is a rectangular-shank turning or copying tool with ANSI/ISO designated styles and dimensional characteristics. A lathe tool cartridge is typically mounted in a custom tool holder for specialized applications. Lathe tool cartridges are typically used in multiples to machine several surfaces simultaneously.
Also, the latter part of your sentence means '...are machined in a single operation.'