Description Overview Three zinser spinning frames available: one model 319.l and two model 421.e All frames are manual type and have an electrojet blower running on line Frame A: Zinser Model 319.L 400 spindles Year 1989 Ring diameter: 52 mm Gauge: 82.5 mm Pk 1601 drafting arm Bottom roller diameter: 52 mm Frame B: Zinser Model 421.E (Two Units) 400 spindles each Year 1992 Ring diameter: 52 mm Gauge: 82.5 mm Pk 1601 drafting arm Bottom roller diameter: 52 mm