Description:OOTDTYFeatures:100% brand new and high qualityWith a ruler stop you can now convert any steel rule into a precision marking tool.Loosen the brass knob for quick adjustment to any position on the edge of the ruler and will hold the measurement firmly when locked.Stand-alone brass knob for quick adjustment of depth, parallelism and verticality.Easy to draw 45 degree 90 degree line. Easy and convenient to carry or store when not in use.The woodworking marking tool is made of aluminium alloy, which is rust proof, durable and sturdy.This ruler positioning block is suitable for both carpenter and home users for a wide range of application.Suitable for a variety of steel rules, transparent ruler can also be used, not easy to fall off.Specification:Color: Black+YellowMaterial: Aluminum AlloySize: approx. 60x43x40x23x23mm(2.36x1.69x1.57x0.91x0.91in)Quantity: 1 pcNote:Transition: 1cm=10mm=0.39inchNo retail package.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package includes:1 x Ruler Positioning Block(other accessories demo in the picture is not included.)