Features Locating Block Suitable for steel ruler with width of 26mm and thickness less than 1.1mm,high strength, high cost performance. Locating Block Can be used with 200/300mm long steel ruler. Made of brass material, high hardness and not easy to damage. The knob can be adjusted quickly and can be measured after locking the edge of the ruler anywhere along the cable. Strong locking ability, it will not drop easily,Widely use Most people's choice. Specification: Condition: 100% Brand new Item Type: Ruler Locating Block Material: Brass Groove: Approx. 28 x 1.5mm / 1.1 x 0.1in Size: Approx. 40 x 10 x 20mm / 1.6 x 0.4 x 0.8in   Package List: 1 x Ruler Locating Block Package List