Strong Hand Tools Adjust-O Magnetic Square, On/Off Switch, Max Pull Force: 65 lbs (30kg), 45° & 90° Angle, 4-3/8 x 3-3/4 x 1″, Patented Design, MSA45, Strong Hand Tools;

The fast & easy way to hold metal workpieces at 30°/60°, 45°, and 90°.

Turn the magnet Off or at the mid-point position when setting up, turn On when you’re ready to work. Fast and safe set-up!
Ideal for round and square tubing, angle, and flat stock.
Easy to clean. Simply turn Off and wipe.