Light weight design extruded and CNC-machined from 6061-T6 aluminumSold in packs of five, each set provides spacing adjustments from 1 to 20 millimetersEach kit includes the following spacers: two 1mm, one 3mm, one 5mm and one 10mm1-1/8`BlackAL6061UPC/EAN/GTIN: 616043825717