GD Grip Strength Trainer (Premium Adjustable Grip Strengthener for Forearm Training) Wrist and Forearm Strengthener

It's a very good product, but I wished It's handles were covered by silicone rubber to avoid funger pain.

Very nice

Very good quality, and even after years using there still no problem.

I've had my GD Grip Ultra 70 exerciser for a little more than 6 years. It is very durable. I especially like how the grip handles stay parallel throughout the exercise. Both the resistance and the grip size are adjustable. The front black knob adjusts the resistance while the silver wheel adjusts the grip size.When the front knob is turned, the spring compression is changed, changing the resistance and moving the bolt forwards or backwards. That also moves the silver wheel the same distance which changes the grip width, which then must be readjusted. For instance, if the front black knob is adjusted 1/2 turn clockwise to increase resistance, that moves the bolt forward and compresses the spring. Then the silver wheel must also be turned 1/2 turn in the same direction to maintain the same grip width as before. Otherwise, increasing the resistance will decrease the grip width making it generally easier, while decreasing the resistance will increase the grip width which makes it generally more difficult. So, the key is to turn both the front knob and the silver wheel the same amount and in the same direction to keep the grip width the same while changing the resistance.Turning the silver wheel to widen the grip will also increase the resistance. This occurs because as the grip gets wider, the cam pressing against it to compress the spring moves horizontally and feels the full force of the spring. When the grip is narrower, the cam moves at a more downward angle giving a mechanical advantage over the wide grip when compressing the spring. It also means that as the grips move closer together, the required force to close the grips becomes less. So, the resistance level isn't linear over the full grip range, though this isn't obvious when using the device.Things that could be better:1. The grips are hard plastic, and at higher resistance level might be a bit uncomfortable and a bit slippery. Workout gloves should help with comfort when needed and friction tape should help with slipperiness.2. The front knob resistance adjustor doesn't stay set very well. It is just a nut on a bolt. When the grip is flexed, the nut moves forward and can easily turn on its own, changing the resistance. If you like to work with progressive resistance, that will undermine the effort. I wound Teflon thread tape around the bolt 15 or 20 times (it's thin) and then put the nut on. That gives it enough resistance to keep the nut/knob from turning on its own while still allowing it to turn easily for adjustment.I highly recommend this grip exerciser for its stable, parallel handles during use, and for its resistance and grip width adjustability. It has a wide range of resistance, though the lightest resistance might still be too strong for many women and boys.

Het is niet goedkoop maar wel top kwaliteit

Very good product

説明にも書いてある通り手のひらに合わせて変えられる可動グリップ、自分に合わせたkgの変更などが簡単に行える器具、説明書は同封して無かったため自分でいじって確認したが金属の円盤がkgの変更、その先にある黒い円筒でグリップの幅を変えられる。良い点・説明にもある通りグリップは垂直水平にあるため5本の指全てを鍛えられる。・機能がまとまっているためこれ一つで鍛えることが出来るしkg、グリップの変更も簡単に行える。・かなり丈夫に作られているため粗雑に扱わなければそうそう壊れないと思う。悪い点・グリップはプラスチックのため鍛えていると手のひらが痛くなってくる。・kgを円盤で変更できるが握りながら感覚で確かめるしかないので自分が今何kg鍛えているかは分からない。