Reese Towpower InterLock Hitch Draw Bar InterLock balls and ball mounts act as a 1 wrench tightening system when used together. Standard hitch balls and ball mounts may also be used with InterLock products but require 2 wrenches for installation. Ball mount measurements Length equals the distance from the center of the ball hole to the center of the pin hole. Drop equals the distance from the top of the shank to the top of the ball platform. Rise equals the distance from the top of the ball platform to the top of the shank. Class III, Receiver Opening Size 2 In., Hitch Ball Hole Size 1 In., Drop 5-1/4 In., Rise 4 In., Length 10 In., Tongue Capacity 500 Lb., Trailer Capacity 5000 Lb., Finish Black Power Coated, Pkg Qty 1 WARNING This product can expose you to chemicals including Bisphenol-A which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.