Aluminum alloy. It is made of solid aluminum block by CNC machining. Can be used for many years. The surface is anodic oxidation treatment, red surface, corrosion resistance.Easy to operate, will not damage the fragile cutting edge. Place a square on the two stock parts that you need to square and fix with a set of clamps.Woodworking right-angle fixture sets are professionally used for assembly and DIY, tap boxes, drawers, cabinets, frames, furniture cabinets, etc. Very suitable for square shelf cabinets. Keep a perfect square when assembling frames, cabinets or any boxes It can be clamped on boxes, photo frames, shelves, cabinets and external corners, etc., which helps to make squares on the glue. It can use the jig tool to check and locate the corners where the boards are connected and glued. It can be used for carpentry and welding at right angles. Practical tools to make your woodworking projects easier.Colour: redMaterial: aluminum alloyPackage Contents:2 x 90 right angle clampsOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.