1/2 inch routers are an essential part of any woodworking tool collection. The larger shank on the bits allows these routers to give clean, stable cuts as the extra mass reduces vibrations, as well as giving the collet more area to grip, reducing the chance of the bit slipping. Another advantage with the larger size is that it helps to dissipate heat which could potentially leave burn marks on the workpiece. These all mean that you can remove more material with each pass without fear of causing damage. For the best of both worlds, look for routers with interchangeable collets so you can swap over to a smaller size for more intricate work.