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 imperial scale 1/8, 3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8 inch. LASER ENGRAVED SCALES: For dependable accuracy, the scales are laser engraved, offering excellent clarity and durability. Whether you opt for metric or imperial measurements, our woodworking tenon caliper can adapt to your requirements. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Material: Aluminum alloy colour: blue Package Contents: 1 x dovetail jig Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.