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Bushing The master bushings and insert bowls with the size from 171/2 to 371/2 inch. They are cast with high-quality alloy steel and the sizes conform to API Spec 7K. There are two kinds of type. pin drive and square drive. API standard rotary slip, drill collar slip, casing slip or roller Kerlly bushing can be contained in... Keywords: Master Bushing Roller Kelly Bushing HDP Bushing 4krvs Bushing RTS4 Bushing HDS Bushing
Categories： Industrial Supplies > Tool SetsDongying Eternal Petro- Tech Co.,Ltd. China 
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