Connor Hitch Pin - 5/8" Lock Pin for Class III, IV, V, 1613620 Trailer Lock FITS STANDARD CLASS III, IV, V SETUPS  Fits all 2" x 2" & 2-1/2" x 2-1/2" receiver holes - PLEASE MAKE SURE THE PIVOT IS LOCKED INTO PLACE BEFORE TOWING USABLE IN ALL TYPES OF HITCH SETUPS  5/8" pin diamater, 3-1/2" usable pin length allows for use even in Class V setups TIME TESTED AND TRUSTED DESIGN  The cotter pin and pin hole design has been an industry standard for decades EASE OF MIND  Tow up to 10,000 GTW without any worries! 3-1/2" usable length CONSTRUCTED FROM HEAVY DUTY SOLID STEEL FOR SUPERIOR STRENGTH  Exceeds SAE J-684 standards for constant usage, zinc finish for rust and corrosion resistance