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10 x 50mm M6 Concrete Self Tapping Anchor, Bolt/Screw, with a hex head, fixes to brick, stone, masonry & marble etc. : Amazon.co.uk: DIY & Tools
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ITW Red Head 1/4" x 4" Tapcon, HW4-4 Hex Head Concrete Screw for Anchoring to Masonry, Block or Brick (500 per Case) : Amazon.co.uk: DIY & Tools
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