1Universal Fitting: Bike spring knob pull pins are popular and flexible, compatible with most dynamic bikes that use a metric system for fittings. 2Wide Application: Suitable for M16 gym bikes, strength training equipment, fitness gear, and even some weight benches, demonstrating versatility. 3Quick Release Design: Built in spring handle for easy release. This design ensures that users will not scratch their hands due to entanglement. 4Easy to Use: These spring knob pull pins boast an user friendly design that allows for quick and easy installation, convenient without taking up too much time. 5Durable Material: Made of iron and plastic for durability and reliability, sturdy, wear resistant, not easy to deform and damage, bring you a long time use. Item Type:SpringKnobPullPin Material: Iron+Plastic 5 x FitnessSpringKnobPins