Hex Head Double Grip Class 4 Screw 50mm

Hex washer head type 17 galvanised, 12g, with 11 threads per inch, 50mm screw with neoprene washer. Primarily used for fastening steel cladding/roofing to timber. The length is measured from the underside of the head. Class 4 finish to AS3566. Use with a 5/16ths nut setter driver bit such as these.