XMark Universal 11-Gauge Preacher Curl Attachment XM-7454 Can be used with all weight benches having a 2" x 2" receiver that pins side to side Heavy duty 11-gauge construction 4 position height adjustment Ideal for in-home use Fits all benches having a 2-inch by 2-inch receiver that pins side-to-side Four position height adjustment Extra-thick 3" Duracraft cushion 11-gauge steel mainframe construction with scratch resistant powder coat finish