Features:This square marking tools can be clamped on the inner and outer corner of your workpiece. Aluminum alloy structure, can ensure the best durability and light usability. Very resistant to corrosion. Professionally used for assembling and DIYing boxes, drawers, cabinets, frames, furniture cabinets, etc. The 90 degree angle square tool can easily use 90 degree right angle wood products and save your time. The scale is 0-45mm on one side and 0-75mm on the other side.portable, easy to carry. Package Includes: 1x Positioning RulerSpecifications: Material: aluminum alloy Size: approx 7.5x1.5x4.5cm/3x0.6x2.0in Scale: 0-40mm & 0-75mm note:Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item.