Helix Plastic Pad Precison Neddles for Dispenser Controller Helix Plastic Pad Precison Neddle, which made in precision, the error of inner diameter is below 0.01mm,all steel pipe special technical designed, no coarse process, reach to the inner and outside wall polished and end of steel pipe angle-stand, make sure the precision of liquid flowed, non-dropping, neilsbed are made from double helix ...