Holds Joints at a 90 - degree angle for precise secure assembly. Material: Aluminum Alloy with steel screw.Clamping range: 3 inch. High hardness, will not rust, suitable for the production of reinforced frame, tank production, etc. Compatible: Fit for Woodworking, fish tank fixing, Picture Frame reinforcement, etc., while generally used for a group of fou. 90° right angle clamp, holds joints at a 90 degree angle, whether you're simply gluing or using fasteners, this miter style clamp will hold stock firm and square at an exact 90 degrees.