Buildex Hex Head With Seal Timber Screws 12g x 50mm Climaseal SKU: 194794 MODEL: X701744 Error. try again later You've successfully joined the club $ 24 .47 pack of 50 Available on orders $50 to $1500. More info × Mitre 10 MAvailable at Mitre 10 MEGA stores. Variants These self drilling Type 17, Hex Head with Seal Timber Screws are suitable for roofing applications. The Hi-Grip seal prevents sheet indentations during fixing. Features and benefits Timber Type 17 screw hex head with seal. Designed for crest fixing. Hi-Grip prevents sheet indentation during fixing.