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Tie Down Engineering Roof Zone 65005 Ladder Hook with Wheel Roof Ridge Extension (Pack of 2) : Amazon.co.uk: DIY & Tools
LFI - Ladder and Fencing Industries Ltd. - LFI Aluminium Roof Ladders: Triangular rungs, strong wheeled ridge hook assembly, PVC covered bearer bars, and extension pieces - 1m and 2m. Visit: http://www.britishladders.co.uk/cc/63_aluminium-roof-ladders.html
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