1.Highquality material: The leg extension and curl machine is made of highquality steel and an ultrathick foam roller. The leg extension attachment is sturdy and durable and has a high load capacity. The outside of the leg extension attachment is coated with black, abrasionresistant powder, which is both beautiful and corrosionresistant. The ultrathick foam padding of the leg extension attachment is comfortable and nonslip, the PU leather cover is wearresistant. 2.High adaptability: The leg extension machine fits under 16/18/26 mm large holes. Mounting screws and bolts are included for easy installation. This fitness equipment accessory can only be mounted on pipes with penetrable holes. Please check your fitness equipment before purchasing. 3.Compatibility: The seated leg extension and curl machine allows the user to adjust during muscle group training according to body size and training requirements. The leg extension attachment has 8 adjustable positions for a better fit. Ideal for strengthening triceps, biceps, chest, shoulder, and back muscles. 4.Leg strength equipment: Leg strength equipment is used for targeted training of individual muscle groups and is thus an effective tool for building and strengthening leg muscles. Due to the compact design and easy handling, they are ideal for use at home and in the gym.