Sandwich Panel Self Drilling Tapping Screw 1) Standard: EN ISO ... 2) Length:13mm ~ 240mm 3) Dia.:3.5m~6.3mm Sandwich Panel Self Drilling Tapping Screw 1) Standard: EN ISO 15480 ... , 8mm AF, Flash drill ,SDS #5 point, cut thread ,Sandwich Panel Self Drilling Screw, C-1022 Steel, Case Hardened, Double ... and tapping screws with monthly production 1000 ton. Pictures: Sandwich Panel Self Drilling Tapping Screw