Single Groove Cast Iron Sheave for "4L" or "A" Belts and "5L" or "B" Belts Finished Bore  Statically Balanced & Powder Coated Common Interchanges BK57 X 1 MB55  Maska YB1 IKO Interchange information is provided as a guide only. Dimensional & performance differences may apply. 
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        Single Groove Cast Iron Sheave for "4L" or "A" Belts and "5L" or "B" Belts Finished Bore  Statically Balanced & Powder Coated Common Interchanges BK57 X 1 MB55  Maska YB1 IKO Interchange information is provided as a guide only. Dimensional & performance differences may apply. 
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