A: Our 3 inch size Cap & Base has an actual inside diameter of 3-1/2 inches to accommodate the thickness of our Wrap. The 3 inch is the application size (on the box) and the smallest size we offer. Your 3 inch diameter pole should have a circumference measurement, around the outside of the pole, of about 9-1/2 inches. Always good to confirm. But, if you have a 3-1/2 inch pole, the circumference will measure about 11 inches.
A: Our Cap & Base inside diameters are a 1/2" bigger to fit over the wrap. If you installing a Cap & Base set without a wrap then you can order a size down. For a 3 1/2" diameter pole, unwrapped (bare), you can use a 3" Cap & Base set. Item # 87CB30.
A: Yes, the 3" cap and base set are actually about 3 1/2" to fit over the Pole-Wrap.
A: This includes the pieces for the top and bottom of one pole.