Faster, more accurate setup than a combined ruler: use these setup blocks to quickly set the height of fences, blades, bits and other cutters with repeatable precision. Extralong 4' blocks: every gauge block is 4 inches long for better support and easier alignment when measuring or setting tools. Stackable and combinable: combine bars to create hundreds of measurement options. Stack setup bars for a wide range of sizes or use them individually to work and measure quickly on the job. Clear, permanent labeling: each block has easytoread etched labels for fast identification and reduced setup errors. Protective fitted case included: stores the set securely and helps protect the combination square and blocks during transportation. Accurate gauge block set sizes: 1/16', 3/32', 1/8', 3/16', 1/4', 1/2', 3/4', 1x8/7x4 Function and compatibility: Designed for setting the height and position of fences, saw blades, router bits, chisel and planer cutters, and other workshop tooling. Works as standalone gauges or as building blocks for custom measurements when combined or stacked. Intended for use wherever quick, repeatable height and thickness setups are needed. Practical applications: Router setup: quickly set router bit height and fence position for accurate dadoes, grooves, and edge profiles. Table saw and jointer adjustments: set blade height and fence offsets to consistent, repeatable distances before cutting. Blade and bit swaps: speed up tool changes by matching cutter height to the saved block stack instead of relying on trial cuts. What you get: A set of extralong 4' setup/gauge blocks in the listed sizes with etched labels, plus a fitted case for organized storage and transportation.