CURT 45935 - ADJUSTABLE BALL MOUNTADJUSTABLE BALL MOUNT 15K ; DUAL BALL WITH 2" SHANK ; 5 1 2" MAX DROP 4 1 2" MAX RISE Highly versatile design adapts to multiple vehicle trailer combinations Adjustable dual ball allows for quick and precise trailer leveling Dual ball can be used on other WD shanks (holes spaced 2 1 2" on center) Shank can be flipped for a max drop of 5 1 2" or rise of 4 1 2" 2" ball rated for 10,000 lbs. and 2 5 16" ball rated for 15,000 lbs. Built in anti rattle