Caution This product is for original replacement parts for our store hummingbird feeders only and is exclusive to our brand. It just fits hand blown glass hummingbird feeders in our store. Please note that this product does not include a glass jar or base. Measurements Thread diameter 1.77 in/4.5 cm; thread depth 1.54 in/3.92 cm. Easy to use Removable hummingbird feeder parts replacement for easy installation and cleaning. Attract hummingbirds The red 3D feeding port on the hummingbird feeder bottom replacement attracts hummingbirds to the feeder. Safety and comfort guaranteed - Unique T-shaped perch so hummingbirds can rest while feeding. - Environmentally-friendly thermal insulation coating to avoid damage at high temperatures. What's in the Box - 1 plastic hummingbird feeder bottom - 1 sealing ring - 1 metal cover