[Various Sizes]Set up gauge blocks are all 3 inches long.Accurate gauge block set sizes: 1/16inch, 3/32inch, 1/8 inch,5/32inch ,3/16inch ,7/32inch ,1/4inch ,5/16inch ,3/8inch ,7/16inch, 15/32inch, 1/2inch, 23/32inch, 3/4inch, 1x2x3inch .You can quickly and accurately set up blades bits and fences with different size combinations.[Premium Metal] 15 blocks solid aluminum structure anodized to safety and prevent damage to router drills and saws. Aluminum alloy is lighter, durable, inflexible, and corrosion-resistant, enough to withstand many uses without wearing out.[Free Combination] Combine to set up 100's of measurements. Stack setup for a wide variation of sizes, or use on their own, work and measure quickly.[laser-engraving]The gauge blocks are all marked with laser-engraving, which is easy to read and accurate. The use of solid aluminum block, anti-oxidation, moderate hardness.Material:Aluminum alloycolour:BlackPackage Contents:15 x Setup BlocksOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.