Made of high quality material, which is durable and has long service life. Ergonomic two sides reading design for comfortable use. Laser engraved imperial and metric scales on the front and side of this angle ruler are clear and precise, making it convenient and easy to read value or make marks while using. One side is metric, and other is imperial. Very useful for machine setup, because it is thick and it can stand alone and the measurement begins from zero. The large center hole design would fit for your finger to hold or fasten this ruler on workpieces, easy and comfortable to place, handle or move around and won't damage fragile cutting edges. This 45 degree aluminum alloy angle ruler is designed to clamp boxes, photo frames, etc, to assist with square making process; an essential tool for woodworking lovers, home builders, carpenters, engineers, and hobbyists., Manufacturer: Namvo