A small handhold that a rock climber utilizes by using his fingertips on an edge, a narrow ledge of rock that ranges from the width of a dime to about an inch. The hold is also called a crimper. The action of grabbing the hold is called crimping.
Crimp holds are not used often because they are very strenuous and it's
easy to injure and stress fingers. Sometimes the thumb is wrapped
around the index finger on a crimp hold to give more pulling power.