SECO-LARM SM-200Q/W Screw-Terminal Surface-Mount Magnetic Contacts, White, Surface-mount magnetic contacts, Screw mount using side tabs, Terminal cover provided Surface-mount magnetic contacts, Screw mount using side tabs Terminal cover provided (required for all applications) ABS plastic case has lip to prevent wires from accidentally touching metal mountings and slotted mounting holes for easier gap adjustment Contact reed switch is SPST, deactivated rhodium on gold under-plating, which results in a long life For N.C. circuits, Mounting screws included