Features: [Top Quality] this engineering triangle scale is made of anodized aluminum alloy, very solid and durable. Designed for maximum durability, this 3 sided architect metal ruler is ideal for durable use[precision imperial scale] aluminum triangle ruler is professional with pinpoint accuracy. With reliable design and accurate performance, the black construction ruler is ideal for architects, engineers, reporters and students[TRIPLE SIDED DESIGN] the classic architect's triple scale, very convenient and useful for professional use[Laser etching technology] all numbers and measurement markings on the drafting rulers are laser etched for maximum brightness and readability. Laser-etched technology effectively prevents scale numbers and markings from wearing or fading. Specification: Material: Aluminum Alloy Size: As Shown Color: Black/BluePackage Included: 1 x RulerNotes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement