Comparison : Item # N11BC4M18, Small Diameter Standard Duty Honing Brushes, 4MM (.157") - 1" (25.4MM)
Item # N11BC4M24, Small Diameter Standard Duty Honing Brushes, 4MM (.157") - 1" (25.4MM)
Item # N11BC4M32, Small Diameter Standard Duty Honing Brushes, 4MM (.157") - 1" (25.4MM)
Item # N11BC4M170200CD, Small Diameter Standard Duty Honing Brushes, 4MM (.157") - 1" (25.4MM)
Item # N11BC4M800CD, Small Diameter Standard Duty Honing Brushes, 4MM (.157") - 1" (25.4MM)