These billet aluminum blocks are installed between the leaf spring and the trailer axle to raise or lower the ride height.Blocks are 6061-T6 Billet Aluminum. Fits 1-3/4" (4.45 cm) wide leaf springs.
 
Each kit includes 2 Trailer Blocks  for 1 axle. (U bolts not included)
Length : 4" (10.16 cm)
Width : 1-3/4" (4.45 cm)
Height : Lift Dependent
 
 
Center Reference Pin Head Height: 0.438" (11.12mm)
Center Reference Pin Head Width: 0.656" (16.66mm)