1. quality stainless steel ruler: This straight stainless steel ruler metal set is made of quality stainless steel to prevent rust and corrosion. The thickness of each metal ruler is 0.5 mm and is not easy to break. Stainless steel ruler metal is durable, but please remember not to bend the ruler. 2. Steel ruler set: The stainless steel ruler is available in 3 different sizes (15 cm / 20 cm / 30 cm) and is suitable for different needs and occasions. Especially suitable for students, engineers, architects, teachers, designers, and other professionals. 3. Unique design: The stainless steel metal ruler has a smooth surface, with one end rectangular and the other end curved. The rightangle end helps you take more accurate measurements, while the curved end ensures comfort and prevents hand injuries from sharp edges. Small holes in the ruler make it easy to hang. 4. Easy to use and store: The stainless steel metal ruler features a smooth surface, with one rectangular end and one curved end. The rightangle end aids in precise measurements, and the curved end provides comfort and safety. Small holes on the ruler allow for convenient hanging.