Honeywell H8908B1002 Thermostat Whole House, White Coatings Center punches are used for

Center punches are used for making accurate hole starting easier and prick punches are used to mark and scribe work pieces

Does not fit hang up vacs

Duct Size:  4" round

Reusable hanger When properly removed they come off cleanly without surface damage

Gripper backing holds runners in place

Honeywell H8908B1002 Thermostat Whole House, White Coatings Center punches are used forHighlights: 12" ribbon of thin, moisture sensitive nylon ribbon wound around three bobbins effectively gives optimum control for reliable operation under changing ambient conditions Mounts in duct or on wall surface Operating humidity range 10 to 60 percent RH (Humidity Range) Positive on and off settings Premier white