Honeywell 102MG11-BP Honeywell Magnets: MG Series, Alnico VIII Sintered Magnet for actuating Hall-effect sensors, Aluminum holder with 8 x 32 threaded shaft for easy installation, 17,02 mm W x 7,87 mm dia [0.67 in W x 0.31 in Dia], Bulk packaging in 100 unit lots