1/4" thick, 4130 material, for 17-1/4" 4-link center measurement, includes four brackets and two bushings (not pictured). To complete the set up, you will also need two spacer bushings (p/n 96044) and two 4-link bracket spacers. 4-link bracket spacers are sold as a pair in p/n 90046 that contains one 90046-1 (left) and one 90046-2 (right).