Rolled Thread DFE Double Nut Ball Screw DFE2020-3.5 A:Cold Rolled & Grounded; B:High Precision & Reliability and Lower Noise; C:High Transmission Efficiency; D:Long Durability, low noise and thermal control. Applications: Medical Equipment; Precision Machinery; High Speed Machinery; Semi-Conductor Equipment; High Speed MachineryCNC Machinery. Same Type Other Mould Numbers DFE2525-3 DFE1610-2.5 DFE3232-3 DFE1616-3.5 DFE1610-3.5 DFE2040-3 DFE1616-6