The adapter boards are just one-side breadboard adapters for LQFP32/48/64 IC's.
This set is very useful for STM32 MCU prototyping using a breadboard (lead pitch 0.1 in or 2.54 mm). The set contains adapter boards for LQFP64, LQFP48, and LQFP32 devices and an adapters for a JTAG programmer.
For more details, see https://github.com/mkulesh/stm32DevelopmentBoards