Qauv DD center latch of elevator nrog lub xub pwg nyom yog tsim rau tuav tubing casing, laum dab tshos, laum yeeb nkab, casing thiab tubing. Lub load yog li ntawm 150 tons 350 tons. Qhov luaj li cas ntawm 2 3/8 mus rau 5 1/2 nyob rau hauv. Cov khoom yog tsim thiab tsim raws li qhov yuav tsum tau muaj nyob rau hauv API Spec 8C Specification rau Drilling thiab Production Hoisting Equipment.