Hidden Hitch - LifeLong Locks 105 Class III-IV 5/8" Stainless Steel Receiver Hitch Lock/Coupler Latch Lock Combo Combo kit includes 5/8 inch receiver lock and coupler lock with 5/8 inch span (PN 100 and PN 104) Stainless steel construction with rubber caps for ultimate weather resistance The square key design offers the ultimate theft protection with thousands of key codes and is virtually impossible to pick Patented ball bearing locking system LifeLong Locks have a lifetime replacement guarantee