Luchuan Angle Clamps, 4PCS Right Angle Fixing Clip,Multi-function woodworking right angle clamp Adjustable Swing Corner Clamp, Corner Clip Fixer for Welding, Wood-Working, Drilling,Making Cabinets

Solid clamps for the price!

The springs are pretty weak. I like threaded corner brackets much more because they create a much more secure joint. These are probably ok for light duty crafts. Harbor freight sells a larger corner bracket for $5 that uses bolts instead of springs