Diameter: 20mm thickness: 10mm hole diameter: 6mm; Nickel plating; Working temperature: max. 80'C; Application: - Electro-acoustic: speaker receiver mike alarm device stage and car audio device etc; - Electronics: permanent magnet vacuum circuit breaker magnetic latching relay watt-hour meter water meter reed sensor etc; - Electrical machines: VCM generators motors CD/DVD ROM electric motor servo motor micro motor motor vibration motor etc; - Mechanical equipment: magnetic separation magnetic separator magnetic machines etc; - Other industries: magnetization paraffin pipeline cleaner magnetic clamp automatic mahjong machine magnetic locks bags leather goods toys craft gift etc.