These brackets are made of 3/16"” steel and are available in straight (05 14 mustang, camaro, firebird) or 10 degree angles (mustang, G body) also available with 3/16” doublers. Holes are 1/2” and 1” apart. Must be used with aftermarket control arms with rod ends. Opening is 1 3/4” wide. Available in 3” 3.25” or 3.5” axle tube sizes.