6in Long curved equalizer connects double-eye springs on tandem or triple axle trailers, and allows for enough movement between the axles to keep the ride smooth and the load secured. Center bolt hole is 9/16in in diameter. » 6in from center to center of bottom holes » 4in from center to center of either bottom hole to the top hole • Connects double-eye springs on dual or triple axle trailers • Springs attach to each of the equalizer with shackle straps (sold separately) • Equalizer is suspended from center hanger (sold separately) • Helps to distribute the weight of the trailer evenly to the front and rear springs • Provides smoother riding trailer • Fits 1-3/4in wide, double-eye leaf springs with 9/16in spring eyes • Center and spring eye holes are all 9/16in