【1】It includes 5pcs top binding binder, 5.24inch=133mm length metal D ring clips( 2 D Ring mechanism). Two-ring mechanisms are for top-binding on the 8.5” edge of a letter size pageNOTICE-HOW to OPEN the PACKAGE:Please use a pair of scissors to cut open the bubble cushion
【2】Made of high quality metal material,overall length: 133mm=5.24 inch
【3】Ring inner height: 30mm=1.2", base width: 26mm=1"