The straight guide bush is essentially a circular flange, usually between 10mm and 40mm outside diameter, which fixes to the router base and acts rather like a small ring fence. The cutter plunges through the middle of the bush and the outside edge of the ring runs against the jig or template, to position the cut. As a professional guide bush supplier, our guide bush passed MISUMI, DME, HASCO and JH Standard. It has the features of high frequency treatment. You can use it on the plastic mould. You also can customize the products according to your requirements.