Secure, consistent stacking: Universal weight stack pin with a sturdy iron pin and plastic knob holds plates firmly in place so selected weights register accurately and remain stable during use. Magnetic lock for safe workouts: The embedded magnetic function in the iron pin provides an easy, reliable lock to prevent accidental disengagement, improving safety and prolonging machine life. Lightweight and easy to use: Compact, lightweight design allows quick insertion and removal with one hand, speeding transitions between sets and simplifying adjustments for any routine. Durable construction: Made from quality materials with a reinforced plastic knob and solid iron pin to withstand repeated use in both home and commercial settings. Antiloss lanyard: Includes an attached lanyard to keep the pin connected to the machine and prevent misplacement during busy workouts or equipment changes. Universal compatibility: Designed to fit most standard gym and multigym weight stacks without changing machine parts; ideal for commercial gym equipment, home workout systems, and rehabilitation machines. Practical performance: Provides accurate weight selection, consistent engagement, and longterm reliability—reducing downtime and improving training flow. Typical applications: Commercial gyms: Fast, secure weight selection for multiple users on selectorized machines, reducing wear and accidental drops. Home multigyms: Easy, safe weight changes for training, circuit workouts, and family use. Physical therapy and rehab clinics: Precise weight stacking for controlled progressions and repeatable setups during patient sessions. What's included: One universal weight stack pin with plastic knob and attached lanyard.