100 Pcs 21x15x10mm Black Aluminum Heatsink for TO-220 Transistor Product Name : Heatsink;Material : Aluminium Fit for : TO-220 Transistors;Color : Black Mount Hole : M3 Screw Hole;Overall Size : 21 x 15x 10mm/ 0.83" x 0.6" x 0.4" (L*W*H) Weight : 268g Package Content : 100(+/-2%) x Heatsink