This item is a replacement adjustment knob, commonly known as a pop pin or spring knob, used for fitness equipment like exercise bikes, treadmills, and weight benches.
- Usage: Quick-release mechanism for adjusting seat height, handlebar position, or tension on workout machines.
- Material: Typically constructed from durable black plastic for the handle and steel for the threaded bolt.
- Design: Features a contoured knob for comfortable grip and a built-in spring to prevent hand injuries during adjustments.
- Common Applications: Exercise bikes, elliptical trainers, and strength training machines.



















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