The Antal mast blocks are hard black anodised aluminium frame with insulated washers for correction protection, also known as a sheave box
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Double Mast block, sheave Ø 40, SWL 2500 kg, 2xø8 bolts
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Mast block, sheave Ø 70, SWL 2000 kg, 3xø6 bolts
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Mast block, sheave Ø 50, SWL 800 kg, 2xø6 bolts
