... .Bit tolerance,best price 4.mould can lead 5.modern CNC processing 1.Features:1. Raw materials: from pure aluminum to duralumin2 ... burrs& sharp edges,ball blasting, sand blasting.;3.Machining: cutting,CNC machining, milling, drilling, griding,punching,screwing etc.;4.Finishing:mill ... .Assembly work Better products ,Better service,Better world! punching machine processing aluminium part