Key features Quick nut adjustment: gently rotate the nut to adjust the resistance strength for immediate, precise control. Durable doublelayer spring: evenly distributed tension that maintains performance and resists deformation over time. Triangle golden ratio design: multipoint support provides safety and stable contact during use. Nspeed torque regulation: adjustable training intensity to match your goals and needs. Why you need it and how it helps Precise resistance control: finetune strength quickly to suit different exercises or progression levels. Reliable stability: even spring distribution and multipoint support reduce wobble and improve safety during use. Durable construction: designed to resist deformation under regular training, reducing maintenance. Flexible training intensity: adjust torque settings to vary difficulty, enabling steady progression. Use scenarios Home gym workouts: quickly dial in the exact resistance between sets for endurance, strength, or powerfocused routines. training sessions: provide clients with consistent, repeatable resistance levels to track progress and maintain form. Progressive strength programs: finely adjust torque to achieve small, controlled increases in load over time. How to use To increase resistance: gently rotate the adjustment nut in the direction that adds strength until the desired level is reached. To decrease resistance: rotate the nut in the opposite direction to reduce strength, testing and settling on the appropriate setting. After setting, perform a brief test movement to confirm the feel and stability before executing your full routine. Care and maintenance Regularly inspect the nut and spring for any signs of wear or deformation. Keep the mechanism clean and dry; avoid exposure to harsh contaminants. Do not force the adjustment beyond its smooth range to prevent damage. Note: This description reflects the product's stated features and functions, focusing on how the nutbased adjustment, doublelayer spring, triangular design, and Nspeed torque regulation contribute to performance, safety, and versatility.