Lifting magnet manufacturers - http://www.walkermagnet.com/index.htm
Permanent lifting magnet - http://www.walkermagnet.com/lifting-magnets-permanent-lift-magnets-neo-series.htm
Battery operated lift magnet - http://www.walkermagnet.com/lifting-magnets-battery-powered-lift-magnets-wbm-series.htm
Electromagnetic chucks for grinding - http://www.walkermagnet.com/workholding-overview.htm
Permanent rotary magnetic chuck - http://www.walkermagnet.com/workholding-rotary-chucks-neostar.htm