Model DD center latch elevators okhala ndi mapewa akulu ndi oyenera kunyamula casing ya chubu, kubowola kolala, chitoliro chobowola, casing ndi machubu. Katunduyo amachokera ku 150 matani 350 matani. Kukula kumachokera ku 2 3/8 mpaka 5 1/2 mkati. Zogulitsazo zimapangidwa ndikupangidwa molingana ndi zofunikira mu API Spec 8C Specification for Drilling and Production Hoisting Equipment.