Features 1、Iron and Plastic Material: Made of premium iron and plastic, this fitness equipment pull pin is sturdy, wear proof, rust resistant, and reliable for long term use. 2、Quick Release Mechanism: The built in spring handle in the knob ensures a smoother and fast release, allowing you to adjust and secure your equipment effortlessly. 3、Universal: Suitable for most exercise bikes with metric systems, as well as strength equipment, fitness devices, and weight benches. This knob offers a versatile solution in your home gym or fitness center. 4、Easy to Use: The fitness adjustment knob is designed for quick and convenient installation, you can easily secure your bike or equipment without any difficulty. 5、Complete Accessories: This pull pin spring knob replacement set contains five knobs. Durable and practical, ensuring optimal performance of the exercise bikes. Item Type: Exercise Bike Pull Pin Spring Knob Material: Iron, Plastic Weight: Approx. 580g/20.5oz Product Size: Approx. 80x50mm/3.1x2.0in Package List 5 x Pull Pin Spring Knob