Question for those in the PT/OT world

I've been having some difficulty woth my grip strength while using some of my heavier weights. I've been told I need to work on my grip. Would these work for my grip? I don't want to get just anything so I need someone who works in PT or OT to help me find what I need. Here is what I've found.

Check this out!

FitBeast Hand Grip Strengthener Workout Kit (5 Pack) Forearm Grip Adjustable Resistance Hand Gripper, Finger Exerciser, Finger Stretcher, Grip Ring & Stress Relief Grip Ball for Athletes