Our A4 1/2-inch 2-ring binder mechanisms (16mm capacity) are manufactured to the highest standards of quality and consistency and feature a bright nickel finish that will bring a professional look to your binders. 2-ring A4 mechanisms are designed to accommodate international A4 and A5 paper. The D-style rings are spaced 8cm apart (3.125") which is the international standard for A4 and A5 binders. OUR BINDER MECHANISMS ARE SOLD BY FULL CARTON QUANTITY ONLY.