Heatsink For A4988 StepStick Stepper Motor Driver Module 3D Printer Reprap Ramps  Feature:  Material: aluminum Color: silver Size: 8.5 x 8.5 x 5mm \/ 0.34 x 0.34 x 0.20inch The aluminium heatsink is specially designed for Raspberry Pi The function of heat sink is to cool down the board and make your Raspberry operate better This 8.5 x 8.5 x 5mm heatsink use with the A4988 drivers Heatsink for A4988 stepstick stepper motor driver module 3D printer Reprap RAMPS， etc.  Note:  This product has no adhesive  Package included:  1 x A4988 3D printer heatsink