Rotary table Master bushings and insert bowls Specifications: We can supply rotary table master bushing and insert bowls sizing from 17 1/2 " to 49 1/2".They are casted with high-quality alloy steel and the sizes conform to API 7K Specification for drilling and well servicing equipment.There are two types,pin drive and square drive.API standard rotary slips,drill collar slips,casing slips and roller kelly bushings can be contained in them.