Waterproof Titanium Pill Holder – Compact Keychain Organizer Micro Size Pill CaseInside diameter: 0.44 in (11 mm) / Inside length: 0.59 in (15 mm). It holds up to 5 nitroglycerin tablets (1/4 in) or 3 aspirin tablets (1/2 in). Please confirm if this pill fob is suitable for your pills before purchase