A basic and cost effective TO-220 PCB mount Heat sink,made from tin plated pressed steel. bolt hole is already drilled, pins are easily soldered onto PCB. overall dims : 27mm high (excluding the 4.5mm high pins) x 16mm wide x 9.3mm deep with a 3.3mm hole. pins: 2mm deep x 4.5 high x 0.6mm thick. As pins are offset from rear face, two heatsinks can be mounted back to back for extreme cooling or to mount two components with one bolt.