Available in different sizes:
31050 - 3/4"
31040 - 5/8"
31010 - 1" **
31020 - 1-1/4" ***
31030 - 1-1/2"
** 31010 is the only flange for bathroom shower rods
*** 31020 Is the only flange for closet rods

All of the above sizes can be used for drapery hardware