Features: 1. Made of brass material, high hardness & not easy to damage. 2. The knob can be adjusted quickly & can be measured after locking the edge of the ruler anywhere along the cable. 3. Strong locking ability, it will not drop easily. 4. Suitable for steel ruler with width of 26mm & thickness less than 1.1mm. 5. Can be used with 200/300mm long steel ruler. Specification: Item Type: Ruler Locating Block Material: Brass/Black aluminum alloy Size: as the picture shows Package List: 1 x Ruler Locating Block+Steel Ruler Brass Ruler Locating Block Leather Marking Locator Angle Scriber Carpenter Location Line Gauge Measuring Tools