ML600 from the RGL Electronics range of products is a Slimline Mini Magnet – 600 lbs (280 kg) Holding Force. 12/24 VDC @480/240mA.
Slimline Mini Magnet
Zoo Hardware Double Slimline Mini Magnet 600lbs (280kg x2) Holding Force ML600-D
Slimline Mini Magnet
Zoo Hardware Monitored Slimline Mini Magnet 600lbs (280kg) Holding Force ML600-M