uxcell 3 Sets Screw Mounting NC Normally Close Magnetic Door Window Reed Switch Product Name : Magnetic DoorSwitch;Contact Type : NC,Normally Close;Contact Capacity : 0.5A(Maximum Switch Current) Voltage : DC 100V;Power : 10W;Gap : 15mm-25mm Each Size(Approx) : 64 x 20x 13mm / 2.5" x 0.8" x 0.51"(L*W*H);Mounting Hole Dia. : 4mm/ 0.16" Color : White;Housing Material : ABS Weight : 64g;package Content : 3 Setsx Magnetic DoorSwitchInstallation Screws