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[THE BEST TRAINER TO IMPROVE YOUR GRIP STRENGTH] Why limit your progress by using the same level of resistance day after day? Try GD Iron Grip, the perfect grip reinforcement. You can effectively improve your grip and hand strength by adjusting the resistance from 55 to 79.5 kg in 6 steps. You can also change the width of the handle in 3 steps to change the range of motion when closing. [ESSENTIAL FOR CLIMBERS] GD IRON EXT.P 80 (GD IRON GRIP EXT 80 + Pinch Grip) is a great tool to strengthen the strength of your fingers. - [Incredible build quality] Made with aluminum grips, strong compression springs, and 4T iron; the GD Iron handle is as sturdy as a tank. GD aims to provide superior quality and perfect craftsmanship. This durable and safe hand reinforcement is the only strength training device you'll ever need. EXTRA EXTENSION - Extend the length of the handles to refine your grip strength training. The included extensions allow you to change the hand placement and reduce the necessary resistance so that you can effectively improve your grip strength and progress to the next level. [One Handle Reinforcer in the World] All GD products are designed, developed and manufactured in our own factory in South Korea. The GD iron handle is patented (no.) US 9,415,262 B2) to protect and provide the best service our customers deserve.