Widely use for high calories electric device, LED light devices and so on heatsink adhesive glue to install heatsink .(Glue isn't always included)Please verify the specification table and ensure that the scale of the heatsink matches that of your component. Feature - It is designed for LED lights lamps and lanterns, LED the cylinder light, reminiscent of warmth dissipation design and manufacturing test. - Fit for 4pcs x 3W / 12pcs x 1W LEDs module( emitter),total as much as 12Watt - total the warmth around 5pcs 3w immoderate energy LED or the 16pcs 1w immoderate energy LED warmth - Better cooling for LED gentle if including a fan , and will cool more leds; Specification Product Name : Heatsink;Material : Aluminium Color : Silver Tone Size (L x W x H): Approx. 11 x 0 x 0 inch / 300x 25x 12mm Package Content : 2 x Heatsink