Description <br> Features: Quickly install spherical knob pull pin designed for simple assembly, compatibility with most bikes and exercise equipment, ideal for busy home gym enthusiasts seeking adjustments. <br> Crafted with durability ABS and reinforced iron cores, this bike ball head pin ensures safe locking during intense workouts while offering ergonomic comfort for repeated use. <br> Perfect for both casual users and professional trainers requiring frequent resistance adjustments on bikes, exercise bikes, and multiple gym setups. <br> Enhances indoor cycling or gym routines with vibrations resistant stability, suitable for high intensity interval training and commercial fitness centers. <br> Features a sweat resistant rotate mechanism and universals compatibility, delivering professional durability for seamless bike accessory upgrades. <br> <br> Specifications: Color:Four Choices <br> Dimension:5.5×6.5cm/2.17×2.56in <br> Component:ABS+Iron <br> <br> Package Includes: 1pc Spherical rotary pin pulling spring knob <br> <br> note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. <br> 2.Due to the differences between different monitors, the picture may not reflect the actual color. <br>