ITEM NAME:10pcs Aluminium Heat Sink Transistor Radiator for TO220 Triode 20*15*1 â„–[ Description: Size: 20*15*10mm Hole position: M3 with threaded hole, hole height 18MM Colour: Silver white Applicable to heat dissipation of IC chips such as TO-220 Packaging includes: 10pcs.Hole position: M3 with threaded hole, hole height 18MM. Colour: Silver white.