John James Saddlers Harness Needles, 25 Pack - Perfectly shaped with rounded tips for hand leatherwork. These work well with Ritza 25 Thread. Measurements: (Size 004 - Small - 50mm length x 0.86mm diameter) (Size 001-002-003 - Medium 55mm length x 1.02mm diameter) (Size 1/0 - Large - 57mm length x 1.09mm diameter) (Size 2/0 - X Large - 60mm length x 1.42mm diameter) (Size 3/0 - XX Large - 62mm length x 1.63mm diameter)