Side Door Elevator The X-series elevators handle all sizes of collar-type tubing, drill pipe and casing. The SMX has a patented latch & latch lock arrangement mounted on the elevator door. The handle protects the latch from accidental opening. Both latches operate from a single handle. The SLX-elevators are offered alternatively to the SMX-elevators. They provide proven technology and economics. The SX-elevator is a mid-sized elevator with higher rating compared to the SLX and SMX, while the SLX DD elevator provides for the largest sizes.