ACTi Outdoor Dome on Vertical Pole with Accessory Sets - Manual (Page 6)

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Installation Guide
6
4. Encircle the pole with the wire straps.
NOTE: The wire straps can hold between 134 ~ 228 mm (5.28 ~ 9 in.) pole diameter.
5. Continuously turn the screw head clockwise to adjust the wire strap until it snugly fits the pole.
Do the same to the other wire strap.