... hole edm machine 1. Small hole processing, different hole 2. Environment-friendly 3. Easy to oprate, esay to learn Main features:Capable of processing deep hole ... of processing wire-cut starting hole, filter hole, nozzle hole, air hole, multi hole, extra deep hole and so on.Capable of ... plane of work piece.Capable of eroding broken drilling head, screw tap in work piece, instead of harming threads ...