Machined solid brass setup bars allow you to accurately set depth of cut, fence to cutter distance, material thickness and more without using calipers or tape measure. Accurately machined to within .005". Set includes six 2-1/2" long bars measuring 1/8", 3/16", 1/4", 5/16", 3/8" and 1/2" square. Can be combined for additional heights. Technical Details: Accurate to +/-.005". Slightly oiled for protection. Comes in protective plastic storage case. Combine bars for additional heights; ie. stack 1/8" and 5/16" to get 7/16". Â