One-lug Hooks or One-hole Hooks allow the narrow product to be displayed utilizing only a single hole in Pegboard. It’s what I think when I see merchandising of linear items like these rulers. Normally I would comment on the ruler display first. But let’s just cut right to the chase and repeat the Mantra…  “One Lug Hooks … One Lug Hook … One Lug Hooks.”

See an earlier example of Ruler merchandising…
Rulers Sold On Hooks

For a thread on One Lug / One Hole Hooks VISIT…
Perfect Use of One-Hole Hooks
One-Hole Hooks Compared” and
One-Hole Hooks on Display

SEE vertical label holders as a space saving device…
Rotated Toothbrush Label Holders” and less well-done
B/P Anchors Toothbrushes” and
Label Orientation Alternates

If you can’t afford to fixture specifically for narrow products, you might try this trick with standard two-hole All Wire Hooks. SEE…
Hook Stagger Violates Convention” and
Erratic Hooks Tighten Display.”