stainless steel screw flight 1.PROFESSIONAL FACTORY 2.EXCELLENT GRADE QUALITY AND REASONABLE PRICE 3.THE MATERIAL IS 304 SS We are the leading manufacturing of stainless steel screw flght in China .Specification Pitch(mm)Outer Diameter(mm)Inner Diameter(mm)Blade Titchness(mm)200200-600≥40Carbon steel ≤25 Abrasion-resistant steel≤25 Stainless steel ≤20250250-600≥40300300-600≥50350350-600≥60400400- ...