Features: This is only a Positioning Block, steel ruler excluded. Made of premium aluminum alloy, lightweight & long time service. Fitting for steel ruler thickness within 3mm, width 23-40mm. Just move the ruler to the required scale and lock the screws, which is convenient and efficient to use. Steel ruler positioning block , Steel ruler limit block ,carpenter marking block. Suitable for the workshop, DIY, tool box, home crafts, modelers, joiners, cabinet makers and woodworkers etc. Specification: Material: Aluminum Alloy color: Gold Size: 68.9x63x17.5mm/ 2.71x2.48x0.69 in Package Contents: 1 x Positioning Block gauge 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.