The old classic wrist roller; a fantastic overall movement for forearm strength and endurance. It can (and should) be used knuckles up and palms up, while rolling toward the user and away from the user. You can use this wrist roller with a loading pin for standard weight plates, or with Olympic plates (with or without a loading pin), or for reeling in a weighted sled (for those times when you want to go a little insane with the intensity). This one should definitely be included in your grip workout!
The roller is constructed of steel tubing, with a textured powder coated finish for enhanced grip. Because it is made of hollow tubing, it can be used on a power rack in "collar mode." That is, a 1" steel bar can be placed inside the tube and into the power rack as a support, so that tremendous weight can be loaded onto the roller for maximum strength gains. This is not possible with many wrist rollers constructed using a solid bar (see the video below).