Hex Head Self Drilling Screws with EPDM Washer. Thread Dia.: #14 (6.3mm); Length(not include hex head): 4″(100mm); Thread Pitch: 1.8mm; Hex Head Size: 10×5.9mm / 0.39″ x 0.23″(Hex WidthxT); Flange Dia.: 12mm / 0.47″; Washer Size: 16 x 3.5mm / 0.63″ x 0.14″(D T); Screw Drilling Range (Plate Thickness): 2-6mm.