The Rollo¿ is a no-nonsense adjustable sight, patterned after the style that was popular for years at Camp Perry. Same range of windage and elevation adjustments as our B Series sights, but easier to carry. Can be mounted on the 1911 slide in the old National Match style that was popular in the early 1960s or, for carry use, mounted slightly forward of the rear edge of the slide using the Caspian Arms¿ Rollo¿ cut. Specification: 4140 chrome-moly steel OA: 1.335" x 0.689" x 0.43" Blade Notch Dim: 0.119" x 0.08"