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 Alloycolor: GoldSize: 68.9x63x17.5mm/ 2.71x2.48x0.69 inPackage Contents:1 x Positioning Block gaugeOnly 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.