What is the range of TV sizes that this ceiling mount can support?

This ceiling mount can support TVs that are between 32" to 70" in size.

What is the weight capacity of the StarTech.com FLATPNLCEIL Ceiling TV Mount?

The weight capacity of the StarTech.com FLATPNLCEIL Ceiling TV Mount is up to 110 lbs. (50 kg).

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StarTech.com FLATPNLCEIL Ceiling TV Mount - 3.5' to 5' Pole - Full Motion - For 32 to 75" Displays - Display Ceiling Mount - Pull Down TV Mount

Ceiling TV mount supports VESA mount compatible TVs from 32 to 75" in size w/ a weight capacity of up to 110 lb. (50 kg)
Pull down TV mount features a telescopic pole can extend from 42 to 61" (1060 to 1560 mm)
Flat screen ceiling mount swivels +60/-60 degrees to adjust to sloped or level ceilings
VESA ceiling mount lets you swivel the display +180/-180 degrees around the pole and tilt downwards -25 degrees without using tools
LCD TV ceiling mount bracket features a hook-and-mount design