The spacing for setting these posts is half the opening

it provides a great deal of depth

Programmable Auxiliary Relays: 2 relays make adding additional features easy

Prevents pass back of cards and codes for a pre-programmed amount of time

2" x 3-1/2" x 72" x .095 Blank Hollow Utility Rail For Vinyl Fences Latches The spacing for setting theseThis rail is used on a vinyl fence. This is a 2" x 3 1 2" x 72" x . 095 Blank Hollow Utility Rail. Long lasting Impact modifiers for strength UV Light Resistant Self Extinguishing Easy care & upkeep Rails must be cut down to lengths shorter than 8' to ship UPS. This rail is cut to customer specifications, please note your desired length during checkout, which will reduce your shipping costs. Rails 8' or shorter will be sent via UPS.