【1】It includes 5pcs Half letter Junior Legal A5 Size ring mechanism;it’s was very well packaged in bubble wrap.Before you purchase the goods, ,plz check the size from the pictures ,in case of buying wrong sizes,thanks. 【2】Half letter Junior Legal A5 Size=204mm overall length,2 side holes distance: 198mm=7.8", ring distance: 70mm/70mm=2.75"/2.75" 【3】Ring capacity: 20mm=0.8", base width: 20mm=0.8" 【4】Made of high quality metal material.Weight: 39g/pc 【5】Iron material,nickel plated. NOTICE-HOW to OPEN the PACKAGE:Please use a pair of scissors to cut open the bubble cushion Shuokecrafts 5pcs Metal A5 Notebook 3-Ring Binder Mechanism Replacement Kit，3 O Rings,0.8" Capacity ,Loose Leaf Binding Spines Combs for Personal Organizers Planners. This product is silver A5 size 3 O ring mechanism, used a lot in goverment departments and education school,etc. And these are nice accessories for diy planners.