[ MAIN PARAMETER ] small heatsink with a M3 size hole; overall size: 20 x 15 x 10 mm / 0.79 x 0.6 x 0.4 inch (L*W*H); color: silver tone. [ MATERIAL ] Aluminum Alloy material is lightweight and dissipate heat fast. [ APPLICATION ] This heatsink is designed for cooling MOSFET transistors, diodes or voltage regulators (TO-220 components), such as 7805, 7812. [ FEATURE ] Without any support pin, this makes it good for prototyping and PCB. [ NOTE ] This cooler is a tiny size, please note before your purchase.