Keyed alike Stainless Steel Class III-IV Receiver Hitch Lock/Coupler Latch Lock (1" Span) 2 pack. Class III-IV Receiver lock works with receivers measuring up to 5/8" diameter x 2 1/2" wide. Coupler Latch Lock works with latches measuring up to 1/4" dia x 1" span. These locks are keyed the same for added convenience. *To add additional locks keyed the same, select (1) keyed the same upcharge per lock ordered. This is found under lock accessories category. This will notify us that you would like all of your locks keyed the same.