SECO Open Clamp Bracket with Compass and 40-minute Vial Prism Poles Accessories the 521-B Spherical Mount at

the 521-B Spherical Mount at left is shown holding a 2022 Alignment Telescope in a 5170 base

The horizontal axis pivots directly over the vertical axis

875″ (73 mm)

The reticle’s filar/bifilar pattern makes for easy use with our optical tooling scales

For accurate distance measurements with tachymeters or total stations

SECO Open Clamp Bracket with Compass and 40-minute Vial Prism Poles Accessories the 521-B Spherical Mount atThe original Open Clamp Pole Bracket and Cradle technology designed by SECO These products offer a fast and efficient way to mount data collectors or controllers to antenna poles and rover rods The aluminum open clamp design features a quick release button and a stainless steel clamp screw that attaches to the pole Depressing the quick release button will allow the Claw Quick Release Cradle or standard cradle to rotate in to a comfortable position for