[ MAIN PARAMETER ] small heatsink with a M3 size hole; body overall size: 34 x 25 x 12 mm / 1.34 x 0.98 x 0.47 inch (L*W*H); color: black. [ MATERIAL ] Aluminum Alloy material is lightweight and dissipate heat fast. [ APPLICATION ] This heatsink is designed for cooling transistors, diodes or voltage regulators (TO-220 components). [ FEATURE ] With 2 support pin, this makes it easy for fixing to your components of diy project. [ NOTE ] This cooler is a tiny size, please note before your purchase.