Accuracy engineered aluminum height gauges ensures accurate measurements from 3 26mm with ±0.01mm tolerance, perfect for woodworking and routers adjustments. Lightweight yet strong anodized aluminum construction resists deformation while maintaining clear royal /metric scale for quick readings. designs for professional woodworkers and enthusiasts needing stable measurement tool for workshop equipment calibration. Essential workshop companion for routers tables, table cut , and milling machines in garages or professional woodshops. multifunction fishbones structure accommodates multiple tool size (5" 12"), streamlining measurement tasks across woodworking projects.