Winder SL Series For slitter winder applications. Key benefits Finbow spreader rolls reduce winder broke and improve separation of reels after slitting. Wide range of size and speed. Spreader rolls for dual bowed spreading. Technical information Material: Carbon steel Surface: Micro-Venta or spiral groove Diameter: 150–415 mm / 5.9–16.3 in Max. length: 13,000 mm / 512 in Coatings: Chrome plated, wolfram carbide Max. speed: 3,000 m/min / 9,800 FPM