Italian Grommet Sizing

grommet sizing used by some Italian manufacturers

Size AKA Internal Diameter Depth Hole Diameter
058 100, 608 2.5mm
054 100, 608 4.5mm 3.5mm 3mm
053 110 3mm
052 120, 408 3.5mm
051 130, 308 5.5mm 4.7mm 4mm
050 140, 208 6.7mm 5.0mm 5mm