Style G bobbins are typically used in small and mid-sized commercial sewing machines for sewing garments, fabrics, leather, and upholstery. Diameter: 55/64″ (0.861 In.), 2.19 cm (approximately that of a U.S. nickel) Height: 25/64″ (0.39 In.), 0.99 cm (slightly taller than 5 nickels stacked) Packed 36 Pcs / Box Style G Sideless bobbins are typically used in small and mid-sized commercial sewing machines for sewing garments, fabrics, leather, and upholstery.Diameter: 55/64″ (0.861 In.), 2.19 cm (approximately that of a U.S. nickel)Height: 25/64″ (0.39 In.), 0.99 cm (slightly taller than 5 nickels stacked)