materials: The leg curl extension machine is built from heavyduty steel to provide a sturdy, stable frame with load capacity for demanding leg training. The abrasionresistant powder coating protects the finish and helps prevent corrosion. adaptability and compatibility: Fits on pipes with 16, 18, or 26 mm throughholes. Mounting screws and bolts are included for easy installation. This attachment can only be mounted on pipes that have holes that can be penetrated; please verify your equipment compatibility before . Compatibility and adjustability: The seated leg extension and curl machine accommodates different body sizes and training requirements. It features 8 adjustable positions to ensure a suitable fit for each user. It is suitable for strengthening triceps, biceps, chest, shoulders, and back in addition to leg work. Leg strengthening device for targeted training: Designed for targeted training of muscle groups, this compact device helps build and strengthen leg muscles. Its simple design and compact footprint make it suitable for use at home or in the gym. Use scenarios: Home gym setup: attach to a compatible frame to perform leg extensions and curls with adjustable resistance, saving space. Gym installation: mount on suitable pipe frameworks to provide quick access for leg work during workouts. Progressive training: with 8 positions, users can begin at a comfortable setting and progress to higher resistance as strength improves.