15 Pcs 39mm OD 6.5mm ID 10mm Height LED Lamp Heatsinks Cooling Fin Product Name : Cooling Fin;Material : Aluminium Color : Silver Tone;Mounting Hole Diameter : 2.5mm Mounting Hole Spacing : 11mm/0.43";Outer Diameter : 39mm / 1.5" Inner Diameter : 6.5mm/ 0.26";Total Height : 10mm/ 0.39" Weight : 202g;Package Content : 15 x Cooling Fin