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3/4" Flush Magnetic Reed set for Steel Doors SD-70 3/4" Diameter Contact and Magnet (Steel Door) - New Stubby Style with 1 1/2" Gap Rugged one piece construction (No need for extra donut adapters) For standard and tighter fitting applications Sensitive "No stick" UL rhodium reed Long leads bent to keep solder off the glass of the reed Two Solder points on 22 AWG 7 stranded UL Wire Thick plastic shell to prevent crushing Normally Closed contacts. No power required Complete with matching  Magnet Fly leads (45cm Approx) Suits Metal fire doors 20mm Hole required. Product Specifications Magnet Assembly SD-70 Contact Assembly   Compatibility: All alarms with Normally Closed inputs.