These are .25" (1/4) HR P&O Steel Plate, CNC Laser Cut and then Folded on a 290 ton CNC Brake to final size. Length is 7.75" to help control axle wrap and 2.5" wide to provide a stable platform. They have 3 spring pin mounting options so you can adjust your WB if you wish and are cut to fit a 3 1/2" axle tube but they have 3 - 1/16" nubs so they fit a 3 3/8" (14 Bolt) tube out of the box, grind off the 3 tiny nubs and they fit a D70 (3 1/2"), pretty simple. Sold in pairs.