General Tools 372B 4 lb. Button Type Alnico MagnetOur industrial grade Alnico (Aluminum/Nickel/Cobalt) Magnets are built for heavy duty use and will not naturally demagnetize over time like other magnets. They are handy in a plethora of applications and work settings. Button Type Alnico Magnets feature a center channel to separate the magnet s poles, creating a radial and expanded magnetic field.General Tools 372B 4 lb. Button Type Alnico Magnet Features:; 3/4 diameter Alnico Magnet with 4 lb. pull capacity; Button Type magnets with full-length center channel; Useful in a number of lifting, holding, sorting, clamping and retrieving applications; Industrial grade; Alnico magnets will not demagnetize and are not susceptible to heat; Center channel separates poles for radial magnetic field; 1/8 center-drilled hole for attaching rods and fasteners; Overall height is 1/2 ; Button shaped magnet has almost unlimited applications; Retrieves screw and steel parts; Center hole in top of magnet for easy fastening; 1/8" core hole; 4 lbs pull