insulation nails, also heat preservation nails made of nylon nail, galvanized screw color: white, blue, grey ... noise and sound insulation .Components: galvanized steel screws and nylon nail. Its length is based on insulation thickness.Common ... screwDiameter1.7mm--5mmLength20mm--150mmColorWhite, blue, grey, red for nylon tube and discStandards: JG158-2004 based on exterior insulation standardsIf ...