Three Link Grade Eight Hardware 9/16"-12 x 4" Includes Six Grade Eight 9/16"-12 x 4" Yellow Zink Bolts, Six 9/16"-12 Nylock Nuts, Two Grade Eight 5/8"-11 x 3 1/4" Yellow Zink Bolts and Two 5/8"-11 Nylock Nuts. This kit is used for three link suspensions that need a 9/16" bolt and use a suspension joint that has a 2.625" mounting width.