Depth Measurement: The wide measuring range of 5-40mm makes the depth ruler suitable for accurate measurement of saw joints. Practical Use: Can be widely applied to quickly set up a table saw or router for easy grooving, trimming, etc. Lockable Design: Able to lock the inner and outer sizes and compare them with other fittings to simplify the operation. Aluminum Alloy: Made of high-quality aluminum alloy, which is not easy to deform and also very durable. Easy Carrying: With compact size and light weight, convenient carrying makes it suitable for indoor and outdoor use.