Product size: width about 15mm, length about 65mm, thickness about 2.5mm, ring: 12x2mm, inner diameter: 8mm.
Our straight ruler keychain is made of solid brass material, not easy to deformity, rust proof and very durable for long lasting performance, you can rest assured that it is safe to use.
Adopting exquisite handmade craftsmanship, the surface has been milling and polishing many times, very smooth,marking etched by high precision process , easy to read and measure can be used in many scenarios in the field of school, architecture, engineering, art, design, math and so on.
You can also give it as a small gift to students, colleges, engineers, architects, teachers, friends and so on.
Lightweight and portable straightedge keychain, small size, easy to carry, can be put in your pocket or bag.