Choker Collar
Locking the gripper into a partially shuts position allows for practice of explosive closes and severe negatives on a gripper stronger than one would normally train with. Typically gripper handles are choked to distances ranging from one inch to almost completely shut. Leaving a gripper choked for an extended period of time should not impact its strength. It is possible for a strong gripper to break a weak hose clamp.
Working with choked grippers has the advantage of allowing for high volume or intensity work without the need to set a gripper on every attempt. When working with a gripper at or beyond an individual's maximum closing strength, this can greatly reduce stress on the knuckles from setting the gripper and releasing it after a negative. Chokers are excellent tools for injury prevention.