Fangrui Product Details Superior Material: High Accuracy Calipers Are Made From Premium Aluminum Alloy. Theundergoes Anodic Oxidation Treatment, Making It Harder, More Wear , With Good Insulating Properties And A Longer Lifespan. Excellent Design: The Dovetail Jig Was Created With Cnc Processing To Accurate Measurements. The Scales Engraved Through Laser Engraving Offers Outstanding Clarity And Durability. The Caliper Provides Both Metric And Imperial Scales To Meet Different Needs. Practical Tool: The Dovetail Fixture Template Allows Easy Production Of Multiple Accurate Dovetail Joints And The Block Size Can Easily And Accurately Be Controlled By Adjusting The Position Of The Teeth And Milling Cutter. It Can Also Be Used To Set The Height Of The Table Saw Blade And The Depth Of The Milling Drill Bit. Versatility: The Configuration Of The Calipers Includes Metric Tenoning Scale 5 6 8 10 12mm, And Imperial Scale 3/16, 1/4, 5/16, 3/8, 1/2 Inch. The Measurement Height Metric Scale Has 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16 Mm And I