Leg curl extension attachment materials: Crafted from heavyduty steel to provide a sturdy, stable construction with a load capacity for demanding leg training. The abrasionresistant powder coating helps prevent corrosion and wear. adaptability and installation: Fits holes of 16, 18, or 26 mm. Mounting screws and bolts are included for easy installation. This accessory can only be mounted on pipes that have throughholes; please check your equipment's compatibility before . Compatibility and adjustability: Designed for seated leg extension and curl machines, allowing adjustment to fit different body sizes and training requirements. The leg extension attachment has 8 adjustable positions to ensure a proper fit for users. Ideal for strengthening triceps, biceps, chest, shoulder and back muscles. Leg strengthening device for home and gym: Targeted training for specific muscle groups with a compact design and straightforward use, making it suitable for both home workouts and gym setups. Use scenarios: Home gym: Add versatile leg extension and curl capability to your seated machine for leg focused workouts. Public or commercial gym: Quick adjustments for multiple users with different body sizes on a single seated extension/curl setup. Multimuscle training: Incorporate into routines that target leg muscles as part of a broader upper and lowerbody training plan.