The CB1 Cage System U-Bench provides a gap within a standard 30mm cage assembly or a similar lens tube setup. A generous supply of mounting holes provide the flexibility necessary to construct small optical assemblies within the U-Bench that might not otherwise fit within the standard cage rods. Solid one-piece construction finished with precision machining allows for rigid construction without compromising the alignment of the overall system. Each end is tapped with our standard SM1 (1.035"-40) thread making it compatible with a wide range of optical mounting components such as our popular Lens Tubes.