Can you repeatedly squeeze this or are you supposed to squeeze and hold? Some types will break the spring if you repeatedly squeeze it..

The spring parts are different from the springs of other adjustable hand grippers. GD IRON GRIP is made with compression springs. So it is more durable and stronger than tension springs. The support parts and body is so strong as well. So I think you don't need to worry about the breakage when you repeatedly squeeze it. If you have any questions, please feel free to contact me. We always do our best to make valuable products which you can use your whole life! Thank you. - Team GD -

When using this does it hurt your hand?

No! but I would advise you start at the lightest setting including attaching the extenders; this will allow your hands to build strength over time. Start with no more than a few minutes every second day and progress forward when you reach that point, "remember to go easy at first".

How do I do maintenance? Need to add some lubricant on the specific area regularly?

Not a Buick.. no lubrication needed.

What is the warranty?

There is a 30 day return policy in general, this item is really a solid item which you have to fiscally damage it, in order it should be damaged. I think it comes with a 1 year manufacturer warranty

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💥 Grip Strength Mastery, Tailored to You!

BUILT LIKE A TANK - Robust 4mm steel plates and precision knurled aluminum grips deliver unmatched durability and safety.
SPRING POWERED SAFETY - Strong compression springs eliminate breakage risk, so you can train hard without worry.
CUSTOMIZABLE STRENGTH LEVELS - 6-step resistance from 55.3 to 198.4 lbs lets you scale your grip training effortlessly.
ALL IN ONE SYSTEMATIC TRAINING - From warm-up to max effort, one device replaces multiple grips for a streamlined, progressive workout.
ERGONOMIC GRIP WIDTH ADJUSTMENT - 3 grip width options ensure a perfect fit for any hand size, maximizing comfort and control.

The GD IRON GRIP EXT 90 is a premium adjustable hand grip trainer featuring 6 resistance levels from 25 to 90 kg and 3 grip width settings for personalized comfort. Constructed with 4mm thick steel plates and precision knurled aluminum, it offers exceptional durability and safety with its unique compression spring system. Designed for systematic grip strength progression, it replaces multiple devices, making it the ultimate tool for serious hand training.

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