iGaging 15-piece "Right On" Precision Setup Block Set Used to set bit and blade heights, drill press depth stop, plunge routers and virtually every machine in your shop physically, precisely and accurately. Each 3" long block is cast in solid aluminum with anodized finish. Blocks are accurate to within a thousandth of an inch in the following thicknesses: 1/16", 3/32", 1/8", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8", 7/­­16", 15/32", 1/2", 23/32" and 3/4". Also includes a precision 1" x 2" x 3" block engraved in 1/32" increments, plus case.