Silver Tone Aluminium Heat Diffuse Heat Sink Cooling Fin 120x100x18mm Product Name : Cooling Fin;Material : Aluminum Color : Silver Tone;Hole Diameter : 2.4mm/0.09"" Hole Number : 10;Fins Number : 16 Overall Size : 120 x 100x 18mm /4.7"" x 3.9"" x 0.7"" (L*W*H);Weight : 180g Package Content : 1 x Cooling Fin Aluminum heatsink cooling fin, generally used in heat treatment and the cooling IC and electronic component. The fins increase the area of the board and thus provide for greater heat transfer.