HeavyDuty Steel Construction This power rack mounted leg extension and curl machine is built for durability. It features an abrasionresistant powder coating and sweatproof vinyl foam rollers. Engineered to withstand intense leg workouts at home or in the gym. Adaptability Fits under with 16/18/26 mm hole. Mounting screws and bolts are included for easy installation. This fitness equipment accessory can only be mounted on pipes that have holes that can be penetrated; please check your fitness equipment before . Compatibility Seated leg extension and curl machine allows the user to adapt to body size and training requirements during muscle group training. The leg extension attachment has 8 positions for use. Ideal for strengthening triceps, biceps, chest, shoulder and back muscles. Leg Strengthening Device Leg strengthening devices are designed for the targeted training of muscle groups and are therefore an effective tool for building and strengthening the leg muscles. The compact design and ease of use make it ideal for use at home and in the gym. Use scenarios Home gym use: Mount on a compatible power rack and perform seated leg extensions to target the quadriceps and leg curls to target the hamstrings. Use the 8 positions for progressive overload. Small to medium gym setting: Quick installation on compatible pipes allows multiple clients to use the attachment. Its compact footprint helps maximize training space. Rehabilitation and conditioning: Use with light resistance and controlled ranges of motion to support kneefocused training, warmups, and muscle maintenance.