Heat Sink When ICs heat up, it can lead to a big problem. Help dissipate the heat with a heat sink or heat sink compounds. Features: Made of black, anodized aluminum Fits TO-220 packages Number of holes: 1 Size: 1.18"L x 1.00"W x 0.50"H (30.0mm L x 25.4mm W x 12.7mm H)