Innovacera TO-220 Ceramic Insulators were to be mounted between the TO-220 packaged power transistors and the heatsink, its dimensions is 14 x 20 x 1 mm (0.55 x 0.79 x 0.04in), the Mounting hole diameter can be 3.8mm or 5mm, without holes and customized holes is also available. It was packed by 100pcs per bag, TO-220 Ceramic Insulator Cooling Pads is widely used for semiconductor devices, high power equipment, integrated circuit, ICMOS tube, IGBT patch insulation, triode, high frequency power supply communication, mechanical equipment, high current, high voltage, high temperature, insulation parts requiring heat conduction.