Fowler’s Space Block PLUS Sets feature pre-sized, solid aluminum space blocks for easy set up in machining, layout work and woodworking. Common sizes make set-up and inspection fast and accurate. Used for setting heights, gaps, clearances, drill press depth stops, fences, alignment, work support and more. Physically sets sizes without the use of a rule, height gage, caliper, or tape measure. Features:• Block sizes in matched pairs: 1-2-3 blocks, 3/4", 1/2", 3/8", 1/4", 3/16", 1/8", 1/16"• 0.001" accuracy on all sides• Includes a 6", steel, beveled straightedge with 1/64" graduations in a vinyl storage sleeve• Solid aluminum construction, blue anodized finish and laser etched, high contrast, white characters• All blocks are 3" long by 1/2" high and marked with decimal and fractional sizes• 1-2-3 blocks feature 1/32" inch graduations on the 2" and 3" sides• Stackable! Use individually or in combinations for countless configurations.• Each set completed in a "shop hardened" protective case*Image shown for representational purposes only