Bought these slides for a pair of large (3ft) drawers in our RV. The original metal slides work well for small drawers, but always jump onto large ones. This solved the problem but required designing a mounting system in cabinets from scratch. This is not due to the slide manufacturer, but to the original housing construction. We are happy with the final decision. I have no idea what the "Transparency" category means, so I only chose 3 stars.