Product Material: High-precision calipers are made of high-quality aluminum alloy, and the surface has been anodized to make it harder and wear-resistant, with good insulation properties and long service life. Product Design: The dovetail calipers are precision machined by CNC to ensure measurement accuracy. The scales are laser engraved for excellent clarity and durability. It has metric/imperial scales to meet different needs. Product Features: This dovetail jig template can easily make multiple precise dovetail joints, and the bump size can be easily and precisely controlled by controlling the position of the teeth and milling cutter. Also used to set blade height and milling bit depth on table saws. Product parameters: Caliper scale parameters: Metric scale for making tenons: 5-6-8-10-12 mm, imperial scale: 3/16-1/4-5/16-3/8-1/2 inches. 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- 16- 1/2- 9/16- 9/16- 5/8 inches.