3 Different Sizes: 3 inch 4 inch 6 inch, for more woodworking workpieces. Applicable to any thickness of wood.Can also be used for securing small picture frames where other large sqaures unable to fit it. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Sturdy Material: Featuring a high-impact materials construction that insures optimal and usability.They are made from tough unbendable impact for extreme durability and rigidity. They maintain their squareness and not flex even under the load of larger assemblies. The 90 degree positioning square can be used with the clamp to position the joint angle of wooden boards for gluing or welding at right angles. They can also be used in 90-degre jigs and fixtures. They can be secured to corners with spring clamps or small F-style clamps and work on both inside and outside corners. Wide Application: You'll have what you need to create square boxes, drawers, cabinets, cabinet carcasses,picture frames,face frame, etc. This is also a great gift for woodworkers., Manufacturer: Akfldms