1.bolts making machines 2.Automatic feed and discharge 3.AUTO ,one person operation ... .Pass rate:98% 5.ISO9001 Machine Name: Z12-20 Bolts Making MachinesMachine Model: Z12-20 SeriesMachine hardware parameters: type Noproduct lengthproduct ... standard bolts, as well as other supporting Z23 series trimming machines, tapping machines, and other products. Z12-20 Bolts making machines