Stainless Steel Of Plastic Covered Manhole Step / 19Ø Stainless Steel Of Plastic Covered Manhole Step Stainless Steel Of Plastic Covered Manhole Step Products Size Specification 19Ø Stainless Steel Of Plastic Covered Manhole Step Products Size Specification Material: SUS Polyethylene or polypropylene plastic polymer. Size: (1)Width:C-300 curved hook-type. (2)Width:C-250 curved hook-type.