The 61-935 series from EAO AG consists of square-shaped lenses and caps in a variety of colors. These components are often used in optical sensors and light guides, particularly in industrial automation and consumer electronics applications. If you're working on projects involving optical sensing or need to add color indicators to your devices, these square lenses and caps can be quite handy.

One thing worth noting is that their compact square shape makes them easy to integrate into tight spaces, which is beneficial in designs where space is limited. Engineers tend to reach for these when they need precise alignment or color-coding features without taking up too much room. Additionally, the availability in multiple colors allows for straightforward status indication or differentiation between different components or functions within a system.