Final answer:
The question is likely about hair clippers with adjustable blades which are attached with screws, used for varying haircuts and styles in hairdressing.
Step-by-step explanation:
The question seems to be incomplete, but it is likely addressing hair clippers which have adjustable blades that are affixed to the unit with screws. Clippers are commonly used for cutting, trimming, and fine-tuning haircuts. The adjustable blades allow for different lengths and styles of cuts, making clippers versatile for various hairdressing tasks. Typically, the blades can be adjusted by loosening or tightening the screws that hold them in place. This feature is particularly useful for barbers and stylists who require precision in their work.