The phrase "a pair of vertical" is correct and usable in written English.
It can be used when referring to two vertical items or elements, often in contexts like design, architecture, or geometry.
Example: "The architect designed a pair of vertical columns to support the structure."
Alternatives: "two vertical" or "a duo of vertical".
A pair of vertical steel rods — which had presumably been installed at one of the Beverly Hills locations, for reinforcement — extended past the wolf-bear's shoulders, like a rungless ladder.
"Above the puckered topography of his bulbous nose and cheeks, a pair of vertical eyes convey a look of cartoon alarm, as if he were not quite sure how he landed in this catastrophe of a face".
Higher oil recovery was obtained with a VI HP wells than with a pair of vertical wells and horizontal wells.
Superconducting coils together with a pair of resistive PF coils, an air core ohmic transformer and a pair of vertical field coils.
The frame is a steel space structure consisted of a tin plate bottom and a space frame (a pair of vertical rods, two pairs of struts and strong horizontal crossbeam.
For some practical engineering applications that the width of the infilled SCSWs in frame structure is much greater than its height, it is common to add vertical stiffening systems to the SCSWs, thus forming the stiffened SCSWs (SSCSWs), and the stiffening system is composed of a pair of vertical stiffeners installed on both sides of the corrugated plate and the connecting high-strength bolts.
Take "Gridlock" (2008), a pair of twisted vertical forms, concave on one side and feathered with hundreds of triangular shards of cut tire on the other, convex side.
Some slabbing mills place a pair of heavy vertical rolls next to the horizontal rolls for edge rolling; this avoids the time-consuming turning of the slab into an upright position.
At either end of this natural wall, in a pair of towering vertical niches, the Buddhas were carved directly from the rock, sometime around the fifth century A.D. The larger one was as tall as a twenty-story building, the smaller two-thirds that height.
The drying system is composed of a pair of stationary vertical dryers and a moveable horizontal dryer that can adjust itself to the contour of a vehicle.
It is designed in standard integrated bipolar technology and it consists of a pair of identical vertical n-p-n transistors anti-symmetrically oriented, whose bases are made up of two diffusions with different depths.
