Black oxided bolt as used on Duesenberg shock absorber mounts. May also be compatible with Buick, Stutz and other cars of the era.
Material: 4140 steel, heat treated grade 8
Finish: Black oxide
Thread: 9/16-18
Thread length: 1.250
Hex head: .875 x .412
Length under head: 3.50
OAL: 3.928
