... with locking triggers as well. ROUND RING (3-ring metal): Standard Capacities: 1/2", 3/4", 1", 1-1/2", 2", ... capacity, measure area shown by arrow.ANGLE D RING (3-ring metal):Standard Capacities: 1", 1-1/2", 2", 2-1 ... /2", 3", 4" Standard Sheet Size: 11x8-1/2" + 1/2" tab ... D RING (3-ring metal):Standard Capacities: 1/2", 3/4", 1", 1-1/2", 2", 2-1/2", 3" Standard Sheet Size: ...