Half of a magnetic sheet floater.
Used in pairs with the unpainted sides vertical and facing each other to magnetically separate stacks of thin sheet, transformer laminations and similar. Slide the stack between them and the upper few sheets fan out upwards so you can grab the top one.
Number of sheets lifted depends on weight so will lift more from a stack of small thin ones than large thick ones. Yours may be the largest size.
Still made and not cheap. Hundreds £ a pair.
Clive
Edited By Clive Foster on 15/11/2022 16:03:56