Models 40 and 70 have the sturdiness suitable for the majority of general laboratory applications. Both models are 14 in. (356 mm) tall.
Models 41 and 71 short rods are 7 in. (178 mm) tall and have a smaller resonant vibration amplitude than the longer rods. Their low profile makes them ideal for compact experimental setups.
Models 42 and 72 rods, which have integrated bases, are a full 24 in. (610 mm) tall for use in experimental setups requiring extra height such as laser beam routing for microscopy applications.
Models 45 and 75 feature patented internal damping system which provides the utmost vibrational immunity from the environment.
Models 70, 71, 72 and 75 have a nylon gear rack set into the rod for rack-and-pinion control over component elevation.

Model 45 and 75 Damped Optical Support Rods are a sophisticated upgrade to the standard supports available in this series, designed for measurements sensitive to acoustic or similar vibrational forces. These rods feature cylindrical masses constrained by damping layers in the upper portions of the rod, located for the most effective dissipation of vibrational energy based on precise computer modeling and testing. Newport’s patented internal damping system provides the utmost vibrational immunity from the environment. Compared to the best alternative designs, Newport damped optical support rods exhibit 60% higher resonant frequency, 5X faster vibration decay and 160% better peak compliance. Both models are 14 in. (356 mm) in length and mount to tables and breadboards securely with four bolts. Model 75 has a nylon gear rack for rack-and-pinion control of mounted elements' elevation. The time-domain responses shown in the figure compare these rods with model 40, the standard steel rod in this family, with the same load at 240 Hz, corresponding to the first bending mode of a cantilevered beam.