... from dongguan factory LED floodlight Street light Aluminum Extrusion Heatsink Profiles , 300*136.5mm Meterial:AL 6063 6061/T5/T6 ... : 300*136.5mm1 Process of heat sink:precision cutting, drilling, skiving,deburring,fine blanking,soldering,bonding, punching, stamping,milling, CNC machining ...