Features: Aluminum Alloy squares clamps. CNC Machined from a solid block of aluminum, durable material, will lasts for years. Easy to handle and the squares have Beveled Edges,won'for t damage fragile cutting edges. This carpentry is professionally used to assemble and DIY by claping boxes, drawers, cabinets, frames, furniture cabinets, etc. Perfect for squaring up shelf cabinets. Designed to be clamped to most kind boxes to assist with squaring during glue up. It can work with clamping tool to check and position the corner for wood board jointing to gluing up or welding at a right angle. There are four types of packaging to choose from: 1x90 Degree Clamping Square / 2x 90 Degree Clamping Squares / 1x90 Degree Clamping Square +2 Clamps / 2x 90 Degree Clamping Squares +4 Clamps. Specifications: Material:Plastic+Metal Dimension of Single Square: approx.100x100x16mm/3.93x3.93x0.62inches Net Weight: Approx.56g/112g/223g/445g Color:Red/Yellow Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x90 Degree Clamping Square / 2x 90 Degree Clamping Squares / 1x90 Degree Clamping Square +2 Clamps / 2x 90 Degree Clamping Squares +4 Clamps