... zinc plated, nickle plated, chrone plated are available aluminium sleeve/ferrule DIN3093, size: from 1mm to 60mmzinc plated, ... , chrone plated are available on requestWe supply the aluminium sleeve in DIN3093, oval sleeves, stop botton, ferrulesjis type, ... are Welcome.4.Surface Treatmentmirror polishing,electrico polishing,machining center,heat treatment.CocoTel:0086-0543-2257116Fax:0086-0543- ...