Features: Four different sizes, 20x20cm/8x8in, 30x30cm/12x12in, 28x20cm/11x8in,28x30cm/11x12in, choose yours. for Triangle Ruler with bottom board, meeting all kinds of woodworking needs. Made of high quality aluminum alloy, lightweight, easy to carry. With double sided la ser millimeter scale, easy to read & use. An essential tool for woodworking lovers, home builders, carpenters, engineers, and hobbyists. Specifications: Material: Aluminum Alloy Size: 20x20cm/8x8in 30x30cm/12x12in 28x20cm/11x8in 28x30cm/11x12in 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. Package includes: 1x for Triangle Ruler 1x Bottom Board