5.5mm/6.3mm Sandwich Panel Self Drilling Screw for Roofing

5.5mm/6.3mm double thread for sandwich panel roofing screw self drilling screwEspecially excellent for sandiwich pannal board fixing purpose , screw is ruspert painted , salt sprey test 1000-1500 hours .Drill Point: #5 ~#4Length Range: to 300mmSurface Treatment: Blue zinc plated; Yellow Zinc plated; Dacromet;                                    Ruspert coating and others;High adhesive EPDM bonded steel washerSimilar Product RecomendContact : Alex /* January 22, 2024 19:08:37 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1