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20.925 200mm Single Core
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20.60 200mm Bonded Pier
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20.48 200mm H Block
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20.45 200mm Cleanout
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20.42 200mm Channel
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20.38 200mm Half Height Sill
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20.25 200mm Three Quarter Lintel
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20.22 200mm 7/8 Closure
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20.21 200mm Knockout Bond Beam Corner
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20.20 200mm Knockout Bond Beam
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20.18 200mm Deep Lintel
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20.13 200mm Half Lintel