High Strength Hex Nylon Head Self Drilling Screw or Roofing Screw Shenzhen Dahe Industrial Co., Ltd. Base Info Model NO.:5.5-8.0Type:DrillingTrademark:DAHESpecification:5.5-8.0Origin:ChainaHS Code:7318140090 Description Pre:DN20 Diameter Can Be Customized High Speed Hydraulic Water Swivel Joint Next:SS304 Stainless Steel Flange