DreamLine Butterfly 30-31 1/2 in. W x 72 in. H Sliding Bi-Fold Shower Door in Chrome, SHDR-4532726-01 Model Size: 30-31 1/2 in. W x 72 in. H; Walk-in Opening: 22 1/2 in.; Hardware Finish: Chrome Configuration: Bi-Fold Shower Door (2 panels); Bi-Fold glass design is ideal for easy access to the shower space Anodized aluminum wall profiles allow up to 3/4 in. adjustment per side for width or out-of-plumb (uneven walls). 1/4 in. (6 mm) thick ANSI certified clear tempered glass; Reversible for a right or left door opening to fit your specific layout IMPORTANT! All measurements should be taken only AFTER walls are finished (tile, back walls, etc.). Walk-In Opening: 20inches