Package of 10. Heavy Duty 1.5” 3-Ring Binder for Medical Charting – Side Opening. These ring binders are the professional-grade standard for hardworking people and places across the country. 1.5-inch rings (250 sheet capacity). Precision engineered No-Gap Rings tested for 50,000 uses to hold tight and stay aligned. Extra-long front and back panels fully cover and protect standard divider tabs.