Features:

Magnetic field turns completely on and off mechanically.
Does not use an electrical power source.
Magnet stays clean.
Holds flat and round surfaces of steel.
Multiplane magnetic grip on five sides.
Machined at 90-degrees.
Pre-tapped holes on four sides for mounting.

Specification:

Max Breakaway: 150 lbs / 68 kg
Full Saturation Thickness: 0.25 in / 6.35 mm
2:1 Shear Working Load: 18.5 lbs / 8.4 kg
Product Weight: 0.7 lbs / 0.31 kg
Dimensions: 1.9 x 1.2 x 2.5 in / 48.2 x 30.4 x 63.5 mm
Magnetic Pole Footprint: 48 mm x 31 mm