Hello. Welcome to Futurlec. The electronic components Superstore. To find the component your looking for, either search by Part Number or visit the relative department. Need Help. TO-220 TO220SMBL - TO-220 Heatsink Small - Black Aluminium Photograph Features Suits TO-220 Devices Long Fins for Improved Heat Dissipation Light Weight Dimensions: Length - 17mm, Width - 17mm, Height - 25mm