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+1 (217) 579-8045Shop Browning 4B74SK / 1004985 / 662289343331 and trust MRO to be your reliable Browning supplier to experience the difference that quality and expertise can make. Trusted since 1898. Fast, Free Shipping. Combination Groove - All Browning B Sheaves permit the running of A and B Belts to be run in them, thus providing a variety of different pitch diameters and horsepowers. Close Grain Cast iron - Close grain cast iron allows Browning to machine our sheaves to the closest tolerances possible.