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.