3 Pcs 41mm OD 22.5mm ID 30mm Height LED Heatsinks Cooling Fin Radiator Product Name : Cooling Fin;Material : Aluminium Color : Silver Tone;Mounting Hole Diameter : 1mm Mounting Hole Spacing : 21mm/0.83";Outer Diameter : 41mm / 1.6" Inner Diameter : 22.5mm/ 0.9";Total Height : 30mm/ 1.2" Weight : 117g;Package Content : 3 x Cooling Fin