Plastic Adjustment Knob Handles: Designed specifically for the adjustment functions of fitness equipment, this series of handles uses materials such as ABS and nylon, combined with an ergonomic shape and anti-slip texture, making adjustments more effortless and secure. Built-in metal threaded inserts enhance durability, and various types are available, including star-shaped, star-shaped, and handwheel designs, to adapt to different adjustment needs and frequencies. Widely used for quick and precise adjustments of seat height, resistance levels, etc.