Imagine a strong clamp that turns on in an instant, won't damage the wood surface and mounts anywhere on a steel table. MagSquare general purpose workholding squares are a tool every woodworker will want in their tool box. Clamping and controlling work on a steel table is now faster, easier and safer....with Magswitch technology. A simple half-turn locks the MagSquare to any ferrous surface. Use MagSquares as guides or positional stops for workholding. MagSquare is more versatile than clamps, faster and easier to use! Simply twist knob on / off to apply or release super strong magnetic grip. Secure workholding anywhere on a steel table! Pre-tapped mount holes (M5 or M6) on all 4 sides for mounting tools or jig fixtures. MagSquares have 90 degree corners for squaring applications and an extremely strong hold. Specifications: 30mm MagSquare, (40 Long x 40 Wide x 36mm Thick) 50mm MagSquare, (75 Long x 52 Wide x 64mm Thick).