Self Drilling Hex With Rubber Gasket 5.5x1 (200pcs)

Self Drilling Hex with rubber gasket Thread Dia.: #12 (5.5mm); Length(not include hex head): 1-1/2′′(38mm); Thread Pitch: 1.8mm; Hex Head Size: 8×5.4mm / 0.31′′ x 0.21′′(Hex WidthxT); Flange Dia.: 11mm / 0.43′′; Washer Size: 16 x 3.5mm / 0.63′′ x 0.14′′(D*T); Screw Drilling Range (Plate Thickness): 1.75-5.25mm Material: Both the screw and the metal washer are made of carbon steel, a zinc-plated surface finish, which is corrosion-resistant; the black washer is made of EPDM, which is wear-resistant and oxidation-resistant.