Setup Blocks Height Gauge Set, Precision Aluminum Setup Bars for Router and Table Saw Accessories Woodworking Set Up. Have you ever noticed how the marks on rulers and tapes seem to grow increasingly cramped as time goes by? Here’s a method to eliminate those tiny lines from your life during crucial machine setups. Accuratecraft Setup Blocks provide precise physical reference points to measure cutter heights or fence positions. Simply choose a block marked with the dimension you need, place it next to your machine tooling, and adjust. Use both your sight and touch to achieve a flawless setup.