Yes4All C33Z Doorway Chin Up Bar for 28" to 32" Door Opening (Chrome - Black Grip) Bar: perfect for door from 28 - 32" opening Bar with 2-grip position, great for many difference, exercises & extreme home fitness programs Best in class chin up bar: thickest (1.8 - 2 mm thick) & heaviest (3 lbs.), highest steel-grade Door requirements: doorway: 25 - 32" wide Door structure must be able to support up user weight & movements