[High Precision]The thickness of each of the blocks is machined to within 0.001inch accuracy. More than accurate enough for your woodworking and joinery needs.[Durable & Solid]These solid aluminum alloy setup blocks with black anodized finish, prevent router bits and saws from damage. Aluminum alloy featured with low-density, and close to even exceed premium steel in strength. So it is lighter, durable, inflexible and corrosion resistant, enough to withstand many uses without wearing out.[Versatile Blocks]They are great for set the height and distance of the fence, blades and bits on your table saw, router and other cutters according to your needs. This gauge block set is a nice addition in your home workshops - for woodworking, metalworking, etc.Colour:B blueMaterial:Aluminum alloyPackage Contents:1 set * Gauge blockOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.