10pcs Aluminum Heat Sink for StepStick A4988 IC Thermal Adhesive 8.8*8.8*5mm Description This Aluminium Heatsink is specially designed for pololu A4983/A4988 StepStick stepper drivers. The function of heat sink is to cool down the board and make it operate better. With Thermal Adhesive, easy to install , Product Name: Aluminum Heat Sink , Condition: Brand New & High Quality , Materal: Aluminum , Size: 8.8mm*8.8mm*5mm , Fin number: 5 , Colour: As the picture shows Package Included: 10* Aluminum Heat Sink