![Springfield 2-7\/8" Heavy-Duty Adjustable Mainstay Package w\/Tension Knob - 9" Base [1250456-LC]](https://cdn11.bigcommerce.com/s-e6ht4dde3g/images/stencil/1280x1280/products/48615/66079/110580XL__87559.1762244675.jpg?c=2 "Springfield 2-7\/8\" Heavy-Duty Adjustable Mainstay Package w\/Tension Knob - 9\" Base [1250456-LC]")
2-7/8" Heavy-Duty Adjustable Mainstay Package with Tension Knob - 9" Base
Package includes 2-7/8″ high-strength rigid 4-keyed anodized aluminum air-powered height adjustment pedestal (500 newton cylinder) with 9″ round anodized base, and locking Trac-Lock™ swivel & slide. 3-1/2″ outer post with 2-7/8″ inner post.
![Springfield 2-7\/8" Heavy-Duty Adjustable Mainstay Package - 10"-12" [1250456-L]](https://cdn11.bigcommerce.com/s-e6ht4dde3g/images/stencil/500x659/products/48614/66078/110579XL__64902.1762244673.jpg?c=2 "Springfield 2-7\/8\" Heavy-Duty Adjustable Mainstay Package - 10\"-12\" [1250456-L]")
![Springfield 2-7\/8" Heavy-Duty Adjustable Mainstay Package w\/Slide [1250301]](https://cdn11.bigcommerce.com/s-e6ht4dde3g/images/stencil/500x659/products/48612/66076/110577XL__13733.1762244668.jpg?c=2 "Springfield 2-7\/8\" Heavy-Duty Adjustable Mainstay Package w\/Slide [1250301]")
![Springfield 2-7\/8" Heavy-Duty Adjustable Mainstay Package - 12"-14.5" [1250450-L]](https://cdn11.bigcommerce.com/s-e6ht4dde3g/images/stencil/500x659/products/48613/66077/110578XL__18570.1762244670.jpg?c=2 "Springfield 2-7\/8\" Heavy-Duty Adjustable Mainstay Package - 12\"-14.5\" [1250450-L]")