Integrated chrome balls supreme towing capacity up to 21,000 lbs. Pins hold tow ball in place and allow quickly switch from 2" ball to 2-5/16" ball. Double aluminum pins are more secure. Using special cylinder lock, which is more secure and durable, without worrying about traditional keys or ordinary buckles breaking. Fit for 2” & 2-5/16” trailer couplers, and all standard 3" receivers. Unique channel shank can be flipped up and down, and take advantage of 8" drop for easy adjust trailer hitch to any situation.