Weight stack extender pin made from durable iron with a robust 2-ring spring-clip collar. Designed to extend the usable range of weight stack machines and home fitness sets while delivering long-lasting strength and reliable performance for commercial gyms and home setups. Key benefits Solid construction: Heavy-duty iron shaft with a sturdy 2-ring spring-clip collar for dependable holding power and durability. Safer workouts: The spring-clip collar secures the pin in place and reduces the risk of accidental dislodging so you can focus on reps without interruptions. Increases training options: Lets you add extension weight to compatible stack-based machines, giving you more resistance choices without replacing equipment. Portable and compact: Lightweight, compact design makes the pin easy to carry and store — ideal for trainers, gym staff, or home users who move between machines or locations. Broad compatibility: Works with most weight stack selector holes and home fitness setups that accept a standard pin-style extender (confirm hole size compatibility before use). Function, materials and performance Material: Durable iron shaft for consistent strength and wear resistance. Locking mechanism: 2-ring spring-clip collar for quick, secure engagement and fast installation or removal. Performance: Built for repeated daily use in both commercial and home environments; designed to hold extended loads reliably when properly installed. Typical applications Commercial gym: Add extra resistance to multi-station and selectorized machines to accommodate stronger clients or to add incremental loading during progressive training. Home gym: Extend your home machine’s weight range without buying additional plates or replacing the unit; useful when you outgrow the factory maximum weight. Mobile trainers / classes: Lightweight and compact for carrying to client sites or group classes to quickly adapt available machines for varied strength levels. Usage notes Confirm selector hole diameter and overall pin fit with your equipment before use. Always insert and secure the clip fully before starting an exercise and inspect the pin and clip for wear periodically. What you get A durable iron weight stack extender pin with a 2-ring spring-clip collar engineered for reliability, portability, and safer training on compatible weight stack equipment.