Introducing our revolutionary product, the {Seat back angle adjustment with the spindle}! As a leading factory in the industry, we are proud to present this exceptional invention. Engineered with precision, this innovative mechanism allows users to effortlessly adjust the angle of their seat back, providing unparalleled comfort and support. Say goodbye to discomfort and hello to customized seating experience with our {Seat back angle adjustment with the spindle}. Trust our factory's expertise in delivering top-notch products that enhance your everyday living.