DescriptionThis is a heat sink set used to run voltage regulators, TRIODE ICs, BJTs, and any TO-220 package parts at their full capacity.Features:This set includesThe aluminum heat sink with threaded mounting screw holeElectrical insulator sheet (conducts heat but not electricity)Plastic insulating washer andMounting screwIt is compatible with both single and dual gauge TO-220 integrated heatsink tabs. For single gauge (the thin style) heatsink tabs you will want to trim or file down the small diameter section of the plastic insulating washer. A simple file such as a nail file works well.