3-4Watt Power LED Lamp Bulb Aluminium Heatsink Cooling Fin Plate 2 Pcs Product Name : Cooling Fin;Material : Aluminium;Color : Silver Tone Power : 3-4W;Center Hole Diameter (Approx.) : 10mm / 0.39";Mounting Hole Diameter : 2.6mm/ 0.1" Plate Diameter : 53m/ 2.1";Fin Outside Diameter : 48mm/ 1.9";Fin Inner Diameter : 29mm/1.1" Fin Height : 25mm/ 1";Total Height : 27mm/1.1" Weight : 77g;Package Content : 2 x Cooling Fin