Curt Manufacturing 81560 3/8 In Safety Hook With Latch G43 18,000 Lb Capacity Bulk Quickly and easily connects safety chains from trailer to tow vehicle Exclusive design and spring-loaded safety latch help ensure secure attachment Meets requirements for high-test chain and features a GTW of 18,000 lbs. Each hook must meet or exceed the gross trailer weight Grade 43 rating for increased tensile strength and abrasion resistance