Description: Aluminum Alloy: 90 Degree Corner clamp is made of high quality material, durable. Easy to Use: There are different holes of positioning squares right angle clamps for you to fixing, ensuring your work more convenient. 90 Degree Woodworking Tools: The 90 degree positioning square are designed to help hold the joint at an exact 90 degrees. Widely Used: Square right angle clamps are suitable for bathtub joints and picture frame joints. Used to assemble boxes, drawers, cabinets, frames, furniture cabinets, etc. Woodworking Tool: Woodworking carpenter clamping tool is widely used in the woodworking industry and is a great tool for carpenters. Size Chart: 3inch: 50mmx80mm/1.97inchx3.15inch, Width: 10mm/0.39inch, Thickness: 15mm/0.59inch 4inch: 100mmx100mm/3.94inchx3.94inch, Width: 15mm/0.59inch, Thickness: 20mm/0.79inch 6inch: 150mmx150mm/5.91inchx5.91inch, Width: 22mm/0.87inch, Thickness: 35mm/1.38inch 8inch: 200mmx200mm/7.87inchx7.87inch, Width: 27mm/1.06inch, Thickness: 38mm/1.50inch Fixture: 105mm/4.13inch Package Includes: 1 Positioning Square Note: Please allow slightly errors due to manual measurement and different monitors.