The spring force can be adjusted from 5 to 165 kg by turning the knob. The spring force can be adjusted from 5 to 165 kg by turning the knob. ABS high-strength engineering plastic, durable and no deformation. ABS high-strength engineering plastic, durable and no deformation. The adjustable gripper was designed for professional athletes and sports fans. The adjustable gripper was designed for professional athletes and sports fans. The robust tool spring reduces the stretching and deformation of the spring and increases the service life of the product. Hold for 5 seconds and perform 20 sets in a row to ensure the workout is effective.It is also the auxiliary device for the rehabilitation training of patients with hand muscle or soft tissue contusion. Descriptions:-The adjustable gripper is designed for professional athletes and sports fans.-Gripper uses perfect construction and is a simple oneStructure.-A strong compression spring and a non-slip handle.-Compressed padding for extra comfort and streamlined design, equipped with closure straps.-ABS high-strength technicalPlastic, durable and no deformation.-The sturdy tool spring reduces the stretching and deformation of the spring and increases the service life of the product.-The plastic handle fits the ergonomics.Anti-slip and safe.-With exquisite and lightweight character, it can be worn to exercise at any time.-The spring force can be adjusted from 5 to 165 kg by rotating the knob.Do not loosen your grip immediately after holding it.-Hold for 5 seconds and perform 20 sets in a row to ensure the workout is effective.It is also the auxiliary device for the rehabilitation training of patients with hand muscle or soft tissue contusion.