[PARAMETER] Overall Size: 40 x 40 x 20 mm / 1.57 x 1.57 x 0.79 inch (L*W*H); Color：Silver Tone. [APPLICATION] Great for cooling chips, stepper motor driver module and other small electronics that didn't come with any cooling. [NOTE] This heatsink come without any thermal tape or adhesive tape, we recommend using some glue (here is not included) to stick. [FEATURE] With parallel line shape notch.It only take seconds to install, easy to install. [MATERIAL] Aluminum alloy, great function for heat transfer.