HSS, HSSCo ,T.C.T .Annular Cutter,Rotabroach cutter, Slugger,Magnetic Drill bits, Rail Cutter ,Core drills are designed as repleacing the twist drills of the over diameter 13mm. The tradition twist drills have to drill the whole diameter of hole . But the HSS, HSSCo ,T.C.T .Annular Cutter,Rotabroach cutter, Slugger,Magnetic Drill bits, Rail Cutter ,Core drills only cut the material of the round the the width of the teeth .So We can get the correct hole and save more time . At the same time , The cutter cut the material so small . So the cutter will have a longer life . It means that we use less time and cost to get better workpiece .And we have High Speed Steel , High Speed Cobalt ,Tungsten Carbide Tip cutter for cutting different material workpeice .especial , we also have the speical design for Rail way . And we also make speical coating as TiAlN ,TiCN or TiN according to the customer different function