Aavid thermalloy high power dissipation aavid thermalloy 1 25gy 50 high power dissipation heatsink 8 8 c w thermal resistance to 220 clip on 60mm long 32mm wide 16mm high this extruded heatsink is pre drilled to accommodate a single to220 package suitable for vertical or horizontal mounting central groove prevents device rotation aavid thermalloy 1 25gy 50 to220 extruded drilled 6 8 c w