Reese Towpower Standard Hitch Draw Bar a removable hitch ball mount designed for versatility and durability. The ball mount measurements include length, which is the distance from the center of the ball hole to the center of the pin hole, drop, measured from the top of the shank to the top of the ball platform, and rise, the distance from the top of the ball platform to the top of the shank. The model 21171 features a Class III rating with a 2-inch receiver opening, a 1-inch hitch ball hole, a 2-inch drop, a 3/4-inch rise, and a 9-inch length, supporting a tongue capacity of 600 pounds and a trailer capacity of 6,000 pounds. Model 21175 also carries a Class III rating with a 2-inch receiver opening and 1-inch hitch ball hole, but with a 3-1/4 inch drop, 2-inch rise, and 9-1/2 inch length, supporting a tongue capacity of 500 pounds and trailer capacity of 5,000 pounds. Both models feature a Metal Shield finish for added protection and come packaged individually. Model Number: 21175