Hex Head Drill Screw With EPDM

Hex head drill screws with composite EPDM washer, material 1022A. Sizes:4.2/4.8/5.5/6.3, length 16mm-150mm. Surface: dacromet, electro galvanized, phosphate. Self-drilling point, no pre-drilling needed, waterproof sealing, for metal sheet & steel roof fixing.