No Set Close - GripFAQ.com

No Set Close Watch the Video - Gripper No Set Close (WMV): Click Image to Enlarge

Wrap the pinky around the handle during the close.

No set refers to placing the gripper in the hand such that prior to the close attempt, there is no tension on the gripper spring. The closing hand is required to generate all force needed to shut the gripper handles. The ability to close a gripper with no set demonstrates true mastery of the gripper.
Due to the poor leverage on the gripper during the close, training no set as the primary approach for developing crushing strength is not encouraged. Risk of injury due to poor hand positioning is increased. Consistent of hand position is also more difficult to obtain, increasing difficulty of tracking progress over time. Some gripper manufactures produce grippers with a narrow spread in order to facilitate no set training for individuals with smaller hands.