New old stock (NOS). Selling a Sentrol 2507-AH-L/2507-AH mount switch and magnet. Complete set with hardware and instructions. It can be used in either a open or closed LooP type. SPDT electrical configuration. Gap Distance is 3/4" minimum to 2-1/2" maximum. Gap distances are nominal make distance plus or minus 20%. Comes with a 3' stainless steel cable. From the Sentrol 2500 series. Free shipping in the USA.