RFID Coin Tag,abs tag,with hole,water and dust-proof, used in Security, Inventory Control, and Patrol checkpoint.... RFIF Coin tag is made of ... center. Usually it is fixed by screw, big size coin tag has a certain thickness to resist metal disturbanceKey Features:Dimension ... management, intendance of the patrol guard, property trackingCustomization Supports:Laser logo/inner numberSilk-screen printing ...