Gear ratio 4:1 Roller width 90 mm Roller diameter 42.6 Maximum opening 5 mm Flat area (+/- 0.01mm) 9 0mm Capable of producing metal foil as thin as .001" All models equipped with 4:1 reduction gear box Custom designed heavy duty packaging Precision hobbed gears from solid steel - no casted gears High strength housing Custom designed maintenance free bronze bushings Induction hardened in strategic areas to 65HRC hardness Polished and machined rolls to achieve a mirror finish We have started utilizing a unique hardening procedure which allows us to market superior rollers that will perform beautifully.Our rollers are made from a high quality carbon steel alloy that offers excellent wear resistance and the outer 3mm of the rolls are hardened to 65 HRC for superior deformation resistance.