The CURT adjustable trailer hitch ball mount with dual ball from CURT is forged from steel and is built for durability and strength for dependable and safe towing. Built for varying applications, the adjustable ball can be raised or lowered for varying heights to ensure level towing. The dual ball has two sizes in one, preventing the need to carry more than one attachment. The highly versatile design works with multiple vehicle-trailer combinations, providing for a rise of up to 4" and a drop of up to 5-1/2", and the dual ball attachment can be used with other CURT WD shanks. Anti-rattle technology encourages a quiet ride providing reduced noise for passengers. The unique vibration resistant clip design prevents the need for two separate clips and installs snugly over both pins with just one. Forged from steel and with its durable carbide powder coat finish and zinc-plated trailer balls, the hitch is weather and corrosion resistant and made to endure years of use. The yellow zinc 2" ball is rated for 10,000 lbs. and the 2-5/16" ball is rated for 20,000 lbs. and is included with a limited lifetime warranty – one year on parts and finish.