Features: Accuracy engineered aluminum height gauges ensures accurate blade 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 DIY enthusiasts needing reliable 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. Specifications: Material: Aluminum Size: about 49x120mm/1.93x4.72inch Package Includes: 1xHeight gauges note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.