Abstract: A system for clamping a bar, as non-exclusive example, a barbell collar, includes a first jaw forming a first portion of a hollow cylinder, a second jaw forming a second portion of the hollow cylinder, a hinge connecting the first jaw and the second jaw, a guide of the first jaw, a first latch element connected to the first jaw opposite the hinge, and a second latch element capable of removably connecting to the first latch element, the second latch element connected to the second jaw opposite the hinge. The first jaw and the second jaw form the hollow cylinder when the first latch element is connected to the second latch element. The system provides may include a weight that is attachable to the second jaw.