Specification: Size: 140mm x 140 mm Color: Red Material: Aluminum Alloy Package include: 4/2 x Positioning Squares 8/4 x Clamps Function: Designed to be clamped to boxes, picture frames, shelf cabinets, 90 degree weld and for outside corners. These versatile, durable squares are made of CNC-machined aluminum, then anodized and engraved with laser-etched scales. Each square features multiple clamping holes to maximize versatility and make positioning and setup easy, whether on the inside or outside of your workpieces Ground and lapped for straightness and parallelism. Features: Made of aluminium alloy, it is durable and practical. 4 Pack VEIKO 140mm X 140mm 90 Degree Right Angle Clamps Positioning Squares Mm Or Inch Scale Aluminum Alloy Woodworking Carpenter Corner Clamping For Picture Frame Cabinet Drawer Reviews P2006293 140mm 90 Degrees Positioning Squares Right Angle Clamp, Aluminium Alloy L-Type Corner Clamp Woodworking Carpenter Clamping Tool for Box Door Picture Frames Making Brand: Namvo True right angles for both inside and outside squares. It is widely used in woodworking and it's a good tool of carpenter. Surface: Red anodized aluminum oxide treatment, exquisite workmanship, has certain oxidation resistance. Aluminum Corner Clamps 90 Degree Positioning Squares, Aluminum Alloy Right Angle Clamp For Woodworking L Type Corner Clamp Position Tool With 4 Clamps For Box Door Picture Frames 140mm Aluminum Alloy Corner Clamp 140mm Easy to Use: Place a square in the corner of the two stock pieces you need to square and secure with a set of clamps.