... high speed, competitive price and easy operation. Screw making machine, bolt making machine, cold former, rivet making machine Features:1. Used as one die two blow ... of two die four blow former), screw drawing machine, hollow rivet making machine. 2.Unique and patent technology of non-clamp ... like big head and short/small body screw, complicate mini screw. 3.Unique and patent technology of whole and ...