【Binding Capacity】Approximately 20-90 sheets. 【Quantity】100 pieces. Suitable for use with 2:1 pitch (2 holes per inch) 23-hole binding machines. 23-hole binding rings are suitable for A4 size paper. They can be cut to the size you need, and are also suitable for A5 and B5 size paper, as well as paperback books. After binding, the pages can be laid flat, flipped 360 degrees, or folded for use, and the operation is simple. Suitable for organizing documents in the office and organizing handmade notebooks. RAYSOONER WR-14.3 Double Iron Ring 23-hole 2:1 Pitch Ring Diameter: 14.3 mm for Binding Multi-color Rings 100 pieces/box 63-15