3 Pcs M16 Pull Pin Knob — Spring Knob Pin for Bike Equipment & Exercise Training Machines Key benefits Fast, positive locking: The springloaded pull pin provides a secure hold and quick release for adjustable parts on bikes and fitness machines. Simple to use: Pull the knob to retract the pin, position the component, then release to lock in place — onehanded operation when you need it. Ready replacement set: Three identical pins give you spares for multiple adjustment points or a convenient kit for maintenance and repairs. What it does and why you need it This M16 pull pin knob is designed to make height and position adjustments safer and easier on bike equipment and exercise training machines. It eliminates loose fittings and reduces setup time by providing a consistent, springloaded locking action. If existing adjustment pins are worn, lost, or stiff, these pins restore smooth, reliable operation. Key attributes Quantity: 3 pieces included. Thread/size: M16 (fits M16 threaded holes or receivers). Function: Springloaded pull pin with a knob for easy grip and release. Compatibility: Intended for use with bicycles, stationary bikes, folding frames, exercise machines, and other fitness equipment that accepts M16 pull pins. Performance: Designed for frequent adjustment — quick engagement and positive locking to minimize wobble and movement. Typical applications Bike seat and handlebar height adjustment: worn adjustment pins to restore secure, repeatable positioning on road, mountain, or folding bikes. Exercise machine adjustments: Use on stationary bikes, rowing machines, or multigyms for safe and convenient adjustment of seats, footrests, or support arms. Portable or folding equipment: Secure folding frames or telescoping supports that need reliable locking during use and fast release for transport. Installation and use tips Ensure the receiving hole or threaded insert is compatible with M16 dimensions before installation. Inspect mating parts for wear or debris to maintain a smooth operating action. Use the included set to multiple pins at once or keep spares on hand for fast maintenance. This 3piece M16 spring knob pin set is a straightforward, practical replacement/upgrade for routine adjustments on bike and fitness equipment, offering dependable locking and easy operation without special tools.