Easy to use: Simply add desired weights to the loading pins to create adjustable resistance for a variety of strength exercises. material: Made from metal and nylon for strength, solid performance and reliable durability. Application: Biceps training device, upper lifting trainer, hand and arm strength training, and general home gym workout equipment. With carabiner: Includes a heavy duty steel carabiner snap hook for convenient setup and use. Use scenarios At home biceps and forearm routine: load pins with weights and perform curls, wrist movements, and forearm strengthening exercises to build arm power and grip. Hand and grip development: integrate into a regular training program to improve finger, hand, and forearm strength as part of upperbody conditioning. Comprehensive upperbody conditioning: combine with other home gym gear to add grip and arm resistance to your overall workout routine.