Keyed Alike - One key opens all three locks. See details in the description field below. We can not match two different lock sets to the same key number. Coupler lock fits 1-7/8", 2" & 2-5/16" couplers. Receiver lock comes with two pins, a standard 5/8" and a 1/2" pin for class I & II receivers having 1-1/4" wide tubes. Stainless steel latch lock is a universal size, 9/32" diameter.