The Hex Head Screw Bolt are an all-purpose self tapping anchor for use on concrete, stone, brick, marble, wood and block. Tried and tested this is the leading 'thunderbolt' brand. The product tightens along its full length and interlocks with the substrate. And for added flexibility, the product is removable.
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Original 'Thunderbolt' brand
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Interlocks with substrate
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Product is totally removable
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Fixes along entire thread