1. Thoughtful Support Lips Each Tangle consists of a precisely machined aluminum blade that fits onto a solid billet handle, featuring two support lips to prevent tipping, and a finely machined edge for true angling. 2. Precise Marking Find the hole corresponding to the scale, insert the pen into the hole, and draw the desired lines. Insert a pencil into the hole, slide it along your workpiece, and mark a line with spacing that follows the material edge precisely. 3. UserFriendly Design The inch or metric scales are clear and readable even for the elderly or in poor lighting. The Tshaped design allows the ruler to glide along the edge of the workpiece, enabling straight lines. 4. Quality Made of quality aluminum alloy material, wearresistant, rustproof, and difficult to break. Suitable for architectural drawing design, carpentry, etc. The anodized surface is flat, smooth, aesthetically pleasing, and rust.