Product Material:The high-precision caliper is made of high-quality aluminum alloy, and the surface is anodized to make it harder and wear-resistant, with good insulation performance and long service life. Product Design:The dovetail caliper is precision-machined by CNC to ensure the accuracy of measurement. The scale is engraved by laser, which has excellent clarity and durability. With metric/imperial scale, it can meet different needs. Product Function:This dovetail jig template makes it easy to make multiple accurate dovetail joints, and it is easy to precisely control the size of the bumps by controlling the positioning of the teeth and milling cutter. Can also be used to set blade height and milling bit depth on table saws. Product Parameters:Caliper scale parameters: metric scale for making tenons: 5-6-8-10-12mm, imperial scale: 3/16-1/4-5/16-3/8-1/2 in. Metric scale for measuring height: 5-6-7-8-9-10-11-12-13-14-16 mm, inch scale: 1/8- 3/16-1/4- 5/16- 3/8- 7/16- 1/2- 9/16- 5/8 in. Specifications: Material: Aluminum Alloy. Size: 95 x 58 x 10 mm / 3.74 x 2.32 x 0.39 inch. Package Includes:1 Set * Metric and Imperial Card Gauge. Note:Please allow 0-1 mm error due to manual measurement.