production tool is used in production to flash firmware to the usb before it is sent to retailer.
there are many usb sticks out there using different ICs. there are hundreds of them...
therefore the 'usb disk production tool' is not a single program, that is an umbrella name for software that has hundreds of variants. since most of the usb sticks are made in China, some of the production tools are leaked and could be found on the internet. as with anything most of the time those leaked versions are bait on shady sites and are infected with malware - they are just used as a bait to get this malware onto your computer.
there are also usb sticks made by reputable brands (Sun, Lexar...). those companies have their software and firmware closely guarded so it is much less likely that you would find such tool for them - unless they are released on purpose for the sake of data recovery or unbricking of the stuck usb sticks. but those recovery products usually just dump known good image and reset setting to factory defaults without allowing tampering with settings that ware mentioned above.