Good Quality; Fast Delivery; Competitive Price; Professional Design We supply a full line of API certified drilling rig components including mast, substructure, drawworks, crown block, traveling block, hook, swivel and rotary table. Diesel Chain Drive DrawworksSpecifications1).Dia. Of Opening:17-1/2 to 49-1/2(in) 2).rotary table are designed and manufactured according to API specificationDesign ...