Aluminum Heat-Sink, For Package TO-220 / L7805 /LM337 Triode Transistors Cooler IC ChipsetQuantity: a lot of 20 PiecesM3 Screw Hole.Size: 19x 15x 10mm/ 0.8" x 0.6" x 0.4" (L*W*H)Thickness" 0.8mmColor : Anodized BlackWeight: 2g/ piecePlease check the specification table and make sure that the size of the heatsink fits that of your component