1. Easy to use: Quick and easy to draw straight lines with accurate dimensions without other cumbersome tools 2. Precise: High working efficiency and accurate scale to correct marking 3. The design of the ruler groove: Just limit the ruler to the required size and lock the screw for easy use 4. Material: and small size, easy to store and carry. Made of Aluminum Alloy, high quality, smooth, rust-proof, and strong, will not crack or deform : Woodworking Model Number: Ruler Locator Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Colour:Photo Color Material:Aluminum Alloy Package Contents: 1 x Steel Ruler Positioning Block 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.