A clamp assembly that can be installed on and removed from its mounting on an elongated structure (e.g., 2×4) without the need for sliding past an end of the structure is disclosed. The clamp assembly may include a pair of clamp bodies with pads for engaging a workpiece. Each of the clamp bodies includes a clamp mount with a movable member arranged to be moved into forced engagement with an exterior surface (e.g., side) of the 2×4 to fix the clamp body on the 2×4. At least one of or both of the clamp bodies include a releasable connection that, when released, allows for the removal of the clamp body from the 2×4 without the need to longitudinally slide the body past an end of the 2×4.