precast hollow core slab production line 1.prestressed steel wire in 2.good load ... capacity 3.Durable quality,long service life Precast hollow core slab production line 1.3.8mm, 4mm,5mm,7mm,9mm,15mm2 ... different size of steel wire.Used in factory of precast hollow core slab factory, beam and lintel making factory. precast hollow core slab production line